CA2451907C - Reciprocating pump with screw actuator - Google Patents
Reciprocating pump with screw actuator Download PDFInfo
- Publication number
- CA2451907C CA2451907C CA2451907A CA2451907A CA2451907C CA 2451907 C CA2451907 C CA 2451907C CA 2451907 A CA2451907 A CA 2451907A CA 2451907 A CA2451907 A CA 2451907A CA 2451907 C CA2451907 C CA 2451907C
- Authority
- CA
- Canada
- Prior art keywords
- housing
- hollow screw
- screw
- nut
- polish rod
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transmission Devices (AREA)
- Reciprocating Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
A reciprocating pump includes a stationary housing and a travelling housing. The travelling housing is telescopically received within the stationary housing and is movable from a retracted position to an extended position. A screw is provided having a lower end and an upper end. The screw is housed within the stationary housing, with the upper end of the screw extending into the travelling housing. A nut is secured to a lower end of the travelling housing. The nut engages the screw. Upon rotation of the screw in a first direction, the nut travels toward the upper end of the screw lifting the travelling housing to the extended position. Upon rotation of the screw in a second direction, the nut travels toward the lower end of the screw lowering the travelling housing to the retracted position. The polish rod is coupled to the travelling housing.
Description
TITLE OF THE INVENTION:
Reciprocating Pump With Screw Actuator FIELD OF THE INVENTION
The present invention relates to reciprocating pump used to pump liquids from a well.
BACKGROUND OF THE INVENTION
Pumping installations which use a reciprocating pump, have a polish rod on surface which is attaches to a string of sucker rods extending down into a well. A
standing ball valve is positioned within the well. A travelling ball valve is positioned at a remote end of the string of sucker rods. The reciprocating pump raises and lowers the polish rod to move the travelling ball valve up and down. As the sucker rods travel upwardly, the ball on the standing ball valve is displaced and liquids are drawn up the well from below the standing ball valve. As the sucker rods travel downwardly, the ball on the standing ball valve falls back into position trapping liquid within the well. As the travelling ball valve descends, the ball on the travelling ball valve is displaced allowing the travelling bail valve to pass through the liquids trapped by the standing ball valve. As the travelling bail valve rises, the ball on the travelling ball valve falls back into position. Liquids trapped by the travelling ball valve are carried up the well with the string of sucker rods.
SUMMARY OF THE INVENTION
The present invention is a novel configuration of reciprocating pump.
According to the present invention there is provided a reciprocating pump which 2 5 includes a stationary housing and a travelling housing. The travelling housing is telescopically received within the stationary housing and is movable from a retracted position to an extended position. A screw is provided having a lower end and an upper end. The screw is housed within the stationary housing, with the upper end of the screw extending into the travelling housing. The screw is mounted for rotation about its longitudinal axis. A motor 3 0 is provided which is adapted to supply a rotational force to the screw. A
nut is secured to a lower end of the travelling housing. The nut engages the screw. Upon rotation of the screw in a first direction, the nut travels toward the upper end of the screw lifting the travelling housing to the extended position. Upon rotation of the screw in a second direction, the nut travels toward the lower end of the screw lowering the travelling housing to the retracted 3 5 position. Means are provided for coupling a polish rod to the travelling housing, such that the polish rod is raised and lowered with the travelling housing.
BRIEF DESCRLPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view of a reciprocating pump constructed in accordance with the teachings of the present invention.
FIGURE 2 is a side elevation view, in section, of the reciprocating pump illustrated in FIGURE 1, with the travelling housing in a retracted position.
FIGURE 3 is a side elevation view, in section, of the reciprocating pump illustrated in FIGURE 1, with the travelling housing in an extended position.
FIGURE 4 is a side elevation view, in section, of an alternative of the reciprocating pump.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a reciprocating pump generally identified by reference numeral 10, will now be described with reference to FIGURES 1 through 3.
Structure and Relationship of Parts:
Referring to FIGURE 1, reciprocating pump 10 includes a stationary housing 12 and a travelling housing 14. Travelling housing 14 has an upper end 16 and a lower end 18.
2 5 Referring to FIGURES 1 and 2, travelling housing 14 is telescopically received within stationary housing 12 and is movable from a retracted position illustrated in FIGURE 2 to an extended position illustrated in FIGURE 3. Referring to FIGURES 2 and 3, a screw 20 is provided having a lower end 22 and an upper end 24. The lower end 22 is machined without threads. Screw 20 is housed within stationary housing 12, with upper end 24 of screw 20 3 0 extending into travelling housing 14. Screw 20 is mounted for rotation about its longitudinal axis 26. A motor 28 is provided which is adapted through a gear box 30 having gears 32 to supply a rotational force to screw 20. Beneficial results have been obtained through the use of a bi-directional electric motor, although it will be appreciated that a hydraulic motor could also be used. A nut 34 is secured to lower end 18 of travelling housing 14 and engages screw 3 5 20, such that, as screw 20 rotates, the height of nut 34, and hence travelling housing 14, can be controlled. Tapered roller bearings 56 are located on the lower end 22 of the screw 20, while screw support bearings 41 are located at the top of screw 20. The bearings act to help rotation and to keep screw 20 aligned. There is also a wiper seal 39 between the stationary housing I2 and the travelling housing 14 to help seal the inside of the stationary housing against weather, dust, and the like.
There are various means that can be provided for coupling a polish rod 36 to travelling housing 14, such that polish rod 36 is raised and lowered with travelling housing 14. In the illustrated embodiment, screw 20 is hollow having a central axial bore 38. Polish rod 36 extends up through bore 38 of screw 20 and is secured to travelling housing 14 by a clamp 40 positioned at upper end 16 of travelling housing 14.
As is common in the art, the pump is located on a pedestal stand 50, with stut~ng box 46. The rod 36 passes through stung box 46, and through the well head 44 which is located over tubing 48 enclosed by casing 52.
Z 5 Operation:
The operation of reciprocating pump 10 will now be described. Referring to FIGURE
3, upon rotation of screw 20 in a first direction, nut 34 travels toward upper end 24 of screw lifting travelling housing 14 to the extended position. Referring to FIGURE 2, upon rotation of screw 20 in a second direction, nut 34 travels toward lower end 22 of screw 20, 2 0 lowering travelling housing 14 to the retracted position. Clamp 40 secure polish rod 36 to travelling housing 14, so that polish rod 36 is raised and lowered with travelling housing 14.
Variations:
It will be appreciated that screw 20 does not have to be hollow. By inverting the 2 5 reciprocating pump one could attach secure polish rod 36 to travelling housing 14 without passing through screw 20. One possible disadvantage of doing so, would be the height required. The inverted system would extend for a height of approximately 22 feet. It would be awkward to service the motor with such an inverted reciprocating pump.
The proto-type machine had a stroke of 86 inches and performed six strokes per minute. It will be appreciated that torque, speed and length of stroke can readily be adjusted by changing the motor used and the intervals at which the motor changes direction.
In another embodiment, the nut 34 is stationary, while the screw 20 reciprocates.
Reciprocating Pump With Screw Actuator FIELD OF THE INVENTION
The present invention relates to reciprocating pump used to pump liquids from a well.
BACKGROUND OF THE INVENTION
Pumping installations which use a reciprocating pump, have a polish rod on surface which is attaches to a string of sucker rods extending down into a well. A
standing ball valve is positioned within the well. A travelling ball valve is positioned at a remote end of the string of sucker rods. The reciprocating pump raises and lowers the polish rod to move the travelling ball valve up and down. As the sucker rods travel upwardly, the ball on the standing ball valve is displaced and liquids are drawn up the well from below the standing ball valve. As the sucker rods travel downwardly, the ball on the standing ball valve falls back into position trapping liquid within the well. As the travelling ball valve descends, the ball on the travelling ball valve is displaced allowing the travelling bail valve to pass through the liquids trapped by the standing ball valve. As the travelling bail valve rises, the ball on the travelling ball valve falls back into position. Liquids trapped by the travelling ball valve are carried up the well with the string of sucker rods.
SUMMARY OF THE INVENTION
The present invention is a novel configuration of reciprocating pump.
According to the present invention there is provided a reciprocating pump which 2 5 includes a stationary housing and a travelling housing. The travelling housing is telescopically received within the stationary housing and is movable from a retracted position to an extended position. A screw is provided having a lower end and an upper end. The screw is housed within the stationary housing, with the upper end of the screw extending into the travelling housing. The screw is mounted for rotation about its longitudinal axis. A motor 3 0 is provided which is adapted to supply a rotational force to the screw. A
nut is secured to a lower end of the travelling housing. The nut engages the screw. Upon rotation of the screw in a first direction, the nut travels toward the upper end of the screw lifting the travelling housing to the extended position. Upon rotation of the screw in a second direction, the nut travels toward the lower end of the screw lowering the travelling housing to the retracted 3 5 position. Means are provided for coupling a polish rod to the travelling housing, such that the polish rod is raised and lowered with the travelling housing.
BRIEF DESCRLPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view of a reciprocating pump constructed in accordance with the teachings of the present invention.
FIGURE 2 is a side elevation view, in section, of the reciprocating pump illustrated in FIGURE 1, with the travelling housing in a retracted position.
FIGURE 3 is a side elevation view, in section, of the reciprocating pump illustrated in FIGURE 1, with the travelling housing in an extended position.
FIGURE 4 is a side elevation view, in section, of an alternative of the reciprocating pump.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a reciprocating pump generally identified by reference numeral 10, will now be described with reference to FIGURES 1 through 3.
Structure and Relationship of Parts:
Referring to FIGURE 1, reciprocating pump 10 includes a stationary housing 12 and a travelling housing 14. Travelling housing 14 has an upper end 16 and a lower end 18.
2 5 Referring to FIGURES 1 and 2, travelling housing 14 is telescopically received within stationary housing 12 and is movable from a retracted position illustrated in FIGURE 2 to an extended position illustrated in FIGURE 3. Referring to FIGURES 2 and 3, a screw 20 is provided having a lower end 22 and an upper end 24. The lower end 22 is machined without threads. Screw 20 is housed within stationary housing 12, with upper end 24 of screw 20 3 0 extending into travelling housing 14. Screw 20 is mounted for rotation about its longitudinal axis 26. A motor 28 is provided which is adapted through a gear box 30 having gears 32 to supply a rotational force to screw 20. Beneficial results have been obtained through the use of a bi-directional electric motor, although it will be appreciated that a hydraulic motor could also be used. A nut 34 is secured to lower end 18 of travelling housing 14 and engages screw 3 5 20, such that, as screw 20 rotates, the height of nut 34, and hence travelling housing 14, can be controlled. Tapered roller bearings 56 are located on the lower end 22 of the screw 20, while screw support bearings 41 are located at the top of screw 20. The bearings act to help rotation and to keep screw 20 aligned. There is also a wiper seal 39 between the stationary housing I2 and the travelling housing 14 to help seal the inside of the stationary housing against weather, dust, and the like.
There are various means that can be provided for coupling a polish rod 36 to travelling housing 14, such that polish rod 36 is raised and lowered with travelling housing 14. In the illustrated embodiment, screw 20 is hollow having a central axial bore 38. Polish rod 36 extends up through bore 38 of screw 20 and is secured to travelling housing 14 by a clamp 40 positioned at upper end 16 of travelling housing 14.
As is common in the art, the pump is located on a pedestal stand 50, with stut~ng box 46. The rod 36 passes through stung box 46, and through the well head 44 which is located over tubing 48 enclosed by casing 52.
Z 5 Operation:
The operation of reciprocating pump 10 will now be described. Referring to FIGURE
3, upon rotation of screw 20 in a first direction, nut 34 travels toward upper end 24 of screw lifting travelling housing 14 to the extended position. Referring to FIGURE 2, upon rotation of screw 20 in a second direction, nut 34 travels toward lower end 22 of screw 20, 2 0 lowering travelling housing 14 to the retracted position. Clamp 40 secure polish rod 36 to travelling housing 14, so that polish rod 36 is raised and lowered with travelling housing 14.
Variations:
It will be appreciated that screw 20 does not have to be hollow. By inverting the 2 5 reciprocating pump one could attach secure polish rod 36 to travelling housing 14 without passing through screw 20. One possible disadvantage of doing so, would be the height required. The inverted system would extend for a height of approximately 22 feet. It would be awkward to service the motor with such an inverted reciprocating pump.
The proto-type machine had a stroke of 86 inches and performed six strokes per minute. It will be appreciated that torque, speed and length of stroke can readily be adjusted by changing the motor used and the intervals at which the motor changes direction.
In another embodiment, the nut 34 is stationary, while the screw 20 reciprocates.
Referring now to FIGURE 4, the nut 34 receives a rotational force from the motor 28 through a gear box, or a drive belt 42 as depicted in FIGURE 4. The screw 20 will either extend or retract, depending on the direction of rotation of the nut 34. In this embodiment, the polish rod 36 may be inserted through the screw 20, and secured by clamp 40. It should be noted that the now-stationary nut 34 must be located near the top of the screw 20 in its rectracted position to make use of the full length of the now-reciprocating screw 20.
The pump may also be adapted for pumping at an angle, which is used in some circumstances.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
The pump may also be adapted for pumping at an angle, which is used in some circumstances.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (2)
1. A reciprocating pump, comprising:
a stationary housing;
a traveling housing telescopically received within the stationary housing, the traveling housing being telescopically movable from a retracted position to an extended position;
a hollow screw having a first end and an second end, the hollow screw being housed within the stationary housing with the second end of the hollow screw extending into the traveling housing, the hollow screw being mounted for rotation about its longitudinal axis;
a motor adapted to supply rotational force to the hollow screw;
a nut secured to the traveling housing, the nut engaging the hollow screw, such that upon rotation of the hollow screw in a first direction the nut travels toward the second end of the hollow screw moving the traveling housing to the extended position extending past the hollow screw, and upon rotation of the hollow screw in a second direction the nut travels toward the first end of the hollow screw moving the traveling housing to the retracted position;
a polish rod extending axially through the hollow screw;
a clamp positioned at an upper end of the traveling housing for coupling the polish rod to the traveling housing, with the polish rod being raised and lowered by telescopic extension and retraction of the traveling housing, the polish rod extending below the traveling housing, the hollow screw, and the stationary housing; and sucker rods connected to a downhole end of the polish rod.
a stationary housing;
a traveling housing telescopically received within the stationary housing, the traveling housing being telescopically movable from a retracted position to an extended position;
a hollow screw having a first end and an second end, the hollow screw being housed within the stationary housing with the second end of the hollow screw extending into the traveling housing, the hollow screw being mounted for rotation about its longitudinal axis;
a motor adapted to supply rotational force to the hollow screw;
a nut secured to the traveling housing, the nut engaging the hollow screw, such that upon rotation of the hollow screw in a first direction the nut travels toward the second end of the hollow screw moving the traveling housing to the extended position extending past the hollow screw, and upon rotation of the hollow screw in a second direction the nut travels toward the first end of the hollow screw moving the traveling housing to the retracted position;
a polish rod extending axially through the hollow screw;
a clamp positioned at an upper end of the traveling housing for coupling the polish rod to the traveling housing, with the polish rod being raised and lowered by telescopic extension and retraction of the traveling housing, the polish rod extending below the traveling housing, the hollow screw, and the stationary housing; and sucker rods connected to a downhole end of the polish rod.
2. A reciprocating pump, comprising:
a stationary housing;
a hollow screw having an upper end and a lower end, the hollow screw being vertically movable within the stationary housing, the hollow screw being secured against rotation about its longitudinal axis;
a nut secured to the stationary housing, the nut engaging the hollow screw such that upon rotation of the nut in a first direction the screw travels upward to an extended position, and upon rotation of the nut in a second direction the nut travels downward to a retracted position; and a motor supplying a rotational force to the nut;
a polish rod extending up through the hollow screw and being secured to the upper end of the hollow screw by a clamp positioned at an upper end of the traveling housing such that the polish rod is extended and retracted with the hollow screw.
a stationary housing;
a hollow screw having an upper end and a lower end, the hollow screw being vertically movable within the stationary housing, the hollow screw being secured against rotation about its longitudinal axis;
a nut secured to the stationary housing, the nut engaging the hollow screw such that upon rotation of the nut in a first direction the screw travels upward to an extended position, and upon rotation of the nut in a second direction the nut travels downward to a retracted position; and a motor supplying a rotational force to the nut;
a polish rod extending up through the hollow screw and being secured to the upper end of the hollow screw by a clamp positioned at an upper end of the traveling housing such that the polish rod is extended and retracted with the hollow screw.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2451907A CA2451907C (en) | 2003-12-18 | 2003-12-18 | Reciprocating pump with screw actuator |
| PCT/CA2004/002098 WO2005059364A1 (en) | 2003-12-18 | 2004-12-09 | Reciprocating pump with screw actuator |
| US11/425,120 US20060275161A1 (en) | 2003-12-18 | 2006-06-19 | Reciprocating Pump With Screw Actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2451907A CA2451907C (en) | 2003-12-18 | 2003-12-18 | Reciprocating pump with screw actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2451907A1 CA2451907A1 (en) | 2005-06-18 |
| CA2451907C true CA2451907C (en) | 2011-09-27 |
Family
ID=34658554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2451907A Expired - Fee Related CA2451907C (en) | 2003-12-18 | 2003-12-18 | Reciprocating pump with screw actuator |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20060275161A1 (en) |
| CA (1) | CA2451907C (en) |
| WO (1) | WO2005059364A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2514916C (en) * | 2005-07-28 | 2012-12-18 | Ici Solutions Inc. | Drive assembly for a reciprocating pump utilizing a linear actuator |
| US8702400B2 (en) * | 2006-08-04 | 2014-04-22 | Millennium Oilflow Systems & Technology Inc. | Surface motor direct-drive sucker-rod screw pump device |
| US9822777B2 (en) * | 2014-04-07 | 2017-11-21 | i2r Solutions USA LLC | Hydraulic pumping assembly, system and method |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2245457A (en) * | 1940-06-29 | 1941-06-10 | Brassell Bryan | Pumping mechanism |
| US2280261A (en) * | 1941-03-17 | 1942-04-21 | Vester O Pounds | Reciprocal motion device |
| NL57111C (en) * | 1942-03-27 | |||
| US2913910A (en) * | 1953-03-02 | 1959-11-24 | Us Industries Inc | Ball bearing, screw jack, pumping mechanism |
| US2891408A (en) * | 1953-03-23 | 1959-06-23 | Jr Joseph P Burt | Oil well pumping assembly |
| US3065704A (en) * | 1959-06-01 | 1962-11-27 | Parkersburg Rig And Reel Compa | Pump actuating systems |
| US4277706A (en) * | 1979-04-16 | 1981-07-07 | Nu-Tech Industries, Inc. | Actuator for heart pump |
| US4544369A (en) * | 1983-11-22 | 1985-10-01 | C. R. Bard, Inc. | Battery operated miniature syringe infusion pump |
| US4962817A (en) * | 1989-04-03 | 1990-10-16 | A.R.M. Design Development | Active reference system |
| SE466765B (en) * | 1989-04-18 | 1992-03-30 | Pharmacia Biosensor Ab | PUMP AND DOSAGE DEVICE |
| US5015162A (en) * | 1989-11-28 | 1991-05-14 | Heppner Terry D | Attachment for an oil well screw pump system |
| US5404767A (en) * | 1993-09-03 | 1995-04-11 | Sutherland; James M. | Oil well pump power unit |
| US5484270A (en) * | 1994-02-28 | 1996-01-16 | Carmeli Adahan | Pump particularly useful in respirator apparatus and exhalation valve assembly therefor |
| CA2140046A1 (en) * | 1995-01-05 | 1996-07-06 | James M. Sutherland | Oil well pump power unit |
| US6213722B1 (en) * | 1996-03-29 | 2001-04-10 | Davor Jack Raos | Sucker rod actuating device |
| US6086339A (en) * | 1997-07-02 | 2000-07-11 | Jeffrey; Jacen A. | Solar-powered reciprocating pump |
| RU2133875C1 (en) * | 1998-01-05 | 1999-07-27 | Акционерная нефтяная компания Башнефть | Well sucker-rod pump drive |
| US6092995A (en) * | 1998-12-31 | 2000-07-25 | Uniflows Co., Ltd. | High precision pump for medical and chemical analyzers |
| US6398514B1 (en) * | 2000-11-22 | 2002-06-04 | Steve C. Smith | Double-acting rod pump |
-
2003
- 2003-12-18 CA CA2451907A patent/CA2451907C/en not_active Expired - Fee Related
-
2004
- 2004-12-09 WO PCT/CA2004/002098 patent/WO2005059364A1/en active Application Filing
-
2006
- 2006-06-19 US US11/425,120 patent/US20060275161A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005059364B1 (en) | 2005-09-15 |
| CA2451907A1 (en) | 2005-06-18 |
| WO2005059364A1 (en) | 2005-06-30 |
| US20060275161A1 (en) | 2006-12-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20210831 |
|
| MKLA | Lapsed |
Effective date: 20191218 |