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GB2349589A - Catalytic converter for internal combustion engines - Google Patents

Catalytic converter for internal combustion engines Download PDF

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Publication number
GB2349589A
GB2349589A GB9909166A GB9909166A GB2349589A GB 2349589 A GB2349589 A GB 2349589A GB 9909166 A GB9909166 A GB 9909166A GB 9909166 A GB9909166 A GB 9909166A GB 2349589 A GB2349589 A GB 2349589A
Authority
GB
United Kingdom
Prior art keywords
catalytic converter
support elements
support
canister
flow direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9909166A
Other versions
GB2349589B (en
GB9909166D0 (en
Inventor
Jean-Pierre Pirault
Alireza Veshagh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AVL List GmbH
Original Assignee
AVL List GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AVL List GmbH filed Critical AVL List GmbH
Priority to GB9909166A priority Critical patent/GB2349589B/en
Publication of GB9909166D0 publication Critical patent/GB9909166D0/en
Publication of GB2349589A publication Critical patent/GB2349589A/en
Application granted granted Critical
Publication of GB2349589B publication Critical patent/GB2349589B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/58—Fabrics or filaments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2835—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support fibrous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/285—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for fibrous supports, e.g. held in place by screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A catalytic converter for internal combustion engines includes a catalyst support 2b which is enclosed in a converter housing and is made of several spaced sheets of woven material 3 oriented in the main flow direction (6, Fig 1.) Each of these woven sheets consists of first and second, orthogonally woven, long support elements 4,5. The first support elements 4 are arranged in parallel with the main flow direction, (6, Fig 1.) whilst the second elements 5 are arranged transversely thereto, with an overlap area 7 being formed at each crossing of first and second support elements 4,5. In these overlap areas 7 the first and second support elements 4,5 are spaced such that flow passages are formed in the main flow direction. The catalytic converter features high efficiency, a small overall size, and simplicity of manufacture.

Description

CATALYTIC CONVERSER MR INTERNAL CCb2M=ON ENGINES This invention relates to a catalytic converter for internal combustion engines, including a catalyst support which is enclosed in a converter housing, henceforth called canister, and comprises several spaced sheets of woven material, henceforth called fabric layers, which are oriented in the main flow direction, each fabric layer consisting of first and second, orthogonally woven, long support elements, and the first support elements extending in parallel with the main flow direction and the second support elements transversely thereto, and with an overlap area being formed at each crossing of first and second support elements.
DESCRIPTION OF THE PRIOR ART Catalytic converters of the above type have been described before, whose catalyst substrates consist of carbon or silicon nitride fibers. The fibers are typically 6-20 pm in diameter and are arranged in strands of 100 to 6,000 fibers. These strands can be woven into a simple cross-weave, which may be prepared such that the volume increases by about 50%. The pretreated cross-weave is further treated with a filler to bond the fibers, allowing load transfer between filaments. In the instance of carbon fibers, carbon may be used as a bonding agent, so that high-temperature applications will become possible.
SUMMARY OF THE INVENTION It is an object of this invention to propose a catalytic converter whose efficiency is greater than that of previous types of converters whilst featuring a comparatively small overall size and simplicity of manufacture.
According to the invention this object is achieved by spacing the first and second support elements in the overlap areas such that flow passages are formed in the main flow direction. In this manner the useful surface of the catalyst support can be increased.
It is provided preferably that the second support elements should be of a loop-or wave-like type and that they form, together with the first support elements, sectional channels of semicircular, rectangular, triangular, or trapezoidal crosssection, which are designed as flow passages. The sectional channels obtained in this way will prevent a fully developed laminar flow and permit turbulent flow, encouraging a secondary radial flow in addition to the main axial flow. As a consequence, heat distribution and mass transfer may be improved significantly.
The best results will be obtained by providing that the distance between first and second support elements in the overlap areas amount to 0.25 to 0.5 mm each. It may be provided in a simple manner that each support element be constituted by a ribbon of a width of 1 mm to 4 mm. It is preferred that each ribbon should consist of bundles of fibers, i. e., preferably carbon fibers, with diameters of 6 to 20 urn.
Interference with the laminar flow and generation of a turbulent flow is promoted by stacking any two adjacent layers of fabric one on top of the other, such that the support elements of the stacked layers are aligned in parallel, and the first or second support elements of one layer lie next to the second or first support elements of the next layer.
To avoid pressure peaks, especially in the entry and exit cones, the weave of the catalyst support may be inhomogeneous.
It may be provided, for example, that the width of the second support elements of at least one fabric layer, or the weave density of at least one fabric layer, should be variable in the main flow direction. This has the additional advantage that the catalytic converter will reach its operating temperature more quickly.
In order to compensate different material expansion of catalyst support and canister, it is provided that the ends of one or several support elements of at least one fabric layer extend beyond the woven body, such that they form compensation springs retaining the catalyst support in the canister surrounding it.
To prevent radial leakage flow between the catalyst support and the canister, i. e. in the region of the compensation springs, the proposal is put forward that the first and/or second support elements of at least one fabric layer should be extended beyond the woven body to form a sheath. Any undesired axial leakage flow through the same region may be prevented by extending at least one first and/or second support element of at least one fabric layer beyond the woven body for the purpose of axial sealing, forming a sealing flange between catalyst support and canister. Such sealing flanges may at the same time act as compensation springs between catayst support and canister.
Special preference is given to a variant of the invention in which catalyst support and canister are provided as an integral unit. Further design simplification is achieved by integrating the entry and/or exit cone of the catalytic converter with the catalyst support. In this variant the flange connecting the catalytic converter to the exhaust system could also be integrated with the catalyst support.
Another proposal is that at least one connecting flange of the catalytic converter be press-fitted into the entry and/or exit cone or the catalyst support.
The catalytic converter will reach its operating temperature faster if the support elements feature carbon fibers and can be connected to an electric power source.
It may further be provided that the fibers of the support elements be roughened and surface-coated. Roughening the fibers will improve the adherence of surface coatings, such as aluminium coatings, on the fibers.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be further described with reference to the accompanying drawings, in which Fig. 1 is an oblique view of a fabric layer of a catalytic converter according to the invention, Fig. 2 is an oblique view of stacked fabric layers of the catalytic converter according to the invention, Fig. 3 is a side elevation of a catalytic converter according to the invention, Fig. 4 is an oblique view of a catalytic converter, without canister, Fig. 5 is a longitudinal section through a catalytic converter, according to one variant of the invention, Fig. 6 is an oblique view of the catalytic converter, according to another variant of the ~ Figs. 7 and 8 are further oblique views of catalytic converters according to the invention, Fig. 9 is a longitudinal section of a catalytic converter, Fig. 10 shows a detail of a catalytic converter according to the invention, Figs. 11 and 12 show further variants of the catalytic converter according to the invention, each in oblique view.
Parts of the same function bear the same reference numerals throughout all variants.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The catalytic converter 1 exhibits a catalyst support 2b, which is enclosed in a canister 2a and comprises a plurality of spaced fabric layers 3 oriented in the main flow direction 6.
Each fabric layer 3 has first support elements 4 and second support elements 5, which are woven orthogonally. The first support elements 4 run in parallel with the main flow direction 6, whilst the second support elements 5 are arranged transversely to the main flow direction 6. At the crossings of first and second support elements 4,5 overlap areas 7 are formed.
In the overlap areas 7 the second support elements 5 form waves 8 such that an empty space will extend between each first and second support element 4,5 in these overlap areas 7. Together with the flat first support elements 4, the waves 8 of the second support elements 5 will form flow passages 10 in the overlap areas 7, which passages 10 are made up of short sectional channels 9, the cross-sections of these passages 10 being semicircular, rectangular, triangular, or trapezoidal.
The sectional channels 9 will prevent a fully developed laminar flow and promote turbulent flow movements, encouraging a secondary radial flow in addition to the main axial flow. As a consequence, heat distribution in the catalytic converter 1 and mass transfer will improve significantly.
In the overlap areas 7 the distance 11 between each first support element 4 and second support element 5 is 0.25 mm to 0.5 mm, approximately. If the sectional channels 9 have a semicircular cross-section, the curvature radius R of the wave 8 may correspond to this distance 11.
The first support elements 4 and the second support elements 5 are constituted by ribbons, each of a width of 1 mm to 4 mm, as shown in Fig. 1. Each ribbon consists of strands of fibers, such as carbon fibers, with diameters of 6 pm to 20 pm.
As is shown in Fig. 2, neighboring fabric layers 3 are stacked one on top of the other, such that the support elements 4,5 of the stacked fabric layers 3 are aligned parallel to each other.
As a consequence, the first support elements 4 of one layer lie next to the second support elements 5 of the next layer, as shown in Fig. 2.
The first support elements 4 may be arranged symmetrically to the second support elements 5, as is shown in Figs 1 and 2. An unsymmetrical arrangement would also be possible, however.
Fig. 5 presents a variant of the invention with an inhomogeneous type of catalyst support 2b. As is shown schematically, the width 12 of the second support elements 5 varies over the length of the catalytic converter 1. As a consequence, the converter 1 will reach its operating temperature more quickly, and pressure peaks are avoided, especially in the entry and exit cones 13,14 (Fig. 5).
Fig. 6 shows a type of catalyst support 2b in which the ends of the first and/or second support elements 4,5 extend beyond the fabric 3 itself and act as compensation springs 15 via which the catalyst support 2b is retained in the canister 2a enclosing it. In this manner differences in material expansion of catalyst support 2b and canister 2a can be compensated. It could further be provided that the first support elements 4 and/or second support elements 5 extend beyond the fabric 3 to form a sheath 16, which will prevent radial leakage flows between the catalyst support 2b and the canister 2a, as is shown in Fig. 7. In the same way an axial sealing flange 17 may be provided, i. e., by extending the first and/or second support elements 4,5 beyond the fabric layer 3 and shaping them into a sealing flange 17. This will prevent any undesired axial leakage flow from occurring between the catalyst support 2b and the canister 2a. Such sealing flanges 17 can also act as compensation springs between catalyst support 2b and canister 2a in this area, as is shown in Figs 8 and 9.
Fig. 10 shows a type of catalyst support 2b where the second support elements 5 are extended to form a double sheath 18.
In the variants shown in Figs 11 and 12 catalyst support 2b and canister 2a are provided as an integral canister-support unit 2, with the entry and exit cones 13,14 of the canister 2a also being integrated with the catalyst support 2b. The connecting flanges 19 are also integral with the canister-support unit 2 in Fig. 11.
Fig. 12 shows a design with a separately configured connecting flange 19, which is press-fitted into the canister-support unit 2. If the support elements 4,5 consist of carbon or contain carbon fibers, they may be also be used as heating. elements for the catalytic converter 1 to reach its operating temperature more quickly. For this purpose the support elements 4,5 are connected to an electric power source.
If desired, the fibers of the support elements 4,5 may be roughened and surface-coated. Roughening will improve the adherence of surface coatings, such as aluminium coatings, on the fibers.
A catalytic converter 1 as described above will exhibit high efficiency and simplicity of manufacture in addition to featuring a very small overall size.

Claims (17)

  1. CLAIMS 1. Catalytic converter 1 for internal combustion engines, including a catalyst support 2b which is enclosed in a converter housing, henceforth called canister 2a, and comprises several spaced sheets of woven material, henceforth called fabric layers 3, which are oriented in the main flow direction, each fabric layer 3 consisting of first and second, orthogonally woven, long support elements 4,5, and the first support elements 4 extending in parallel with the main flow direction 6 and the second support elements 5 transversely thereto, and with an overlap area 7 being formed at each crossing of first and second support elements 4,5, wherein the first and second support elements 4,5 are spaced in the overlap areas 7 such that flow passages 10 are formed in the main flow direction 6.
  2. 2 Catalytic converter 1 as claimed in claim 1, wherein the second support elements 5 are of a loop-or wave-like type and form, together with the first support elements 4, sectional channels 9 constituting flow passages 10.
  3. 3. Catalytic converter 1 as claimed in claim 1 or 2, wherein the cross-sections of flow passages 10 are semicircular, rectangular, triangular, or trapezoidal.
  4. 4. Catalytic converter 1 as claimed in any of claims 1 to 3, wherein the distance 11 between first and second support elements 4,5 in the overlap areas 7 amounts to 0.25 to 0.5 mm each.
  5. 5. Catalytic converter 1 as claimed in any of claims 1 to 4, wherein the support elements 4,5 are constituted by ribbons of a width of 1 mm to 4 mm each.
  6. 6. Catalytic converter 1 as claimed in claim 5, wherein each ribbon consists of fibers, i. e., preferably carbon fibers, with preferred diameters of 6 to 20 olim.
  7. 7. Catalytic converter 1 as claimed in any of claims 1 to 6, wherein any two adjacent fabric layers 3 are stacked one on top of the other, such that the support elements 4,5 of the stacked layers are aligned in parallel, and the first or second support elements 4,5 of one layer 3 lie next to the second or first support elements 5,4 of the next layer 3.
  8. 8. Catalytic converter 1 as claimed in any of claims 1 to 7, wherein the width 12 of the second support elements 5 of at least one fabric layer 3, or the weave density of at least one fabric layer 3, is variable in the main flow direction 6.
  9. 9. Catalytic converter 1 as claimed in any of claims 1 to 8, wherein the ends of one or several support elements 4,5 of at least one fabric layer 3 are extended beyond the woven body, such that they form compensation springs 15 retaining the catalyst support 2b in the canister 2a surrounding it.
  10. 10. Catalytic converter 1 as claimed in any of claims 1 to 9, wherein the ends of the first and/or second support elements 4,5 of at least one fabric layer 3 are extended beyond the woven body to form a sheath 15.
  11. 11. Catalytic converter 1 as claimed in any of claims 1 to 10, wherein at least one first and/or second support element 4,
    5 of at least one fabric layer 3 is extended beyond the woven body for the purpose of axial sealing, to form a sealing flange 17 between catalyst support 2b and canister 2a.
  12. 12. Catalytic converter 1 as claimed in any of claims 1 to 11, wherein catalyst support 2b and canister 2a are provided as an integral unit.
  13. 13. Catalytic converter 1 as claimed in any of claims 1 to 12, wherein the entry and/or exit cone 13,14 of the catalytic converter 1 is integrated with the catalyst support 2b.
  14. 14. Catalytic converter 1 as claimed in any of claims 1 to 13, wherein at least one connecting flange 19 of the catalytic converter 1 is integrated with the catalyst support 2b.
  15. 15. Catalytic converter 1 as claimed in any of claims 1 to 13, wherein at least one connecting flange 19 of the catalytic converter 1 is press-fitted into the entry and/or exit cone 13,14 or the catalyst support 2b.
  16. 16. Catalytic converter 1 as claimed in any of claims 1 to 15, wherein the support elements 4,5 feature carbon fibers and can be connected to an electric power source.
  17. 17. Catalytic converter 1 as claimed in any of claims 1 to 16, wherein the fibers of the support elements 4,5 are roughened and surface-coated.
GB9909166A 1999-04-21 1999-04-21 Catalytic converter for internal combustion engines Expired - Fee Related GB2349589B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9909166A GB2349589B (en) 1999-04-21 1999-04-21 Catalytic converter for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9909166A GB2349589B (en) 1999-04-21 1999-04-21 Catalytic converter for internal combustion engines

Publications (3)

Publication Number Publication Date
GB9909166D0 GB9909166D0 (en) 1999-06-16
GB2349589A true GB2349589A (en) 2000-11-08
GB2349589B GB2349589B (en) 2002-11-06

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GB9909166A Expired - Fee Related GB2349589B (en) 1999-04-21 1999-04-21 Catalytic converter for internal combustion engines

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102889110A (en) * 2012-10-09 2013-01-23 浙江达峰汽车技术有限公司 Novel carrier for motor vehicle exhaust catalytic cleaner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102889110A (en) * 2012-10-09 2013-01-23 浙江达峰汽车技术有限公司 Novel carrier for motor vehicle exhaust catalytic cleaner

Also Published As

Publication number Publication date
GB2349589B (en) 2002-11-06
GB9909166D0 (en) 1999-06-16

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110421