CA1227654A - Magnetic locking pins for locksets - Google Patents
Magnetic locking pins for locksetsInfo
- Publication number
- CA1227654A CA1227654A CA000405433A CA405433A CA1227654A CA 1227654 A CA1227654 A CA 1227654A CA 000405433 A CA000405433 A CA 000405433A CA 405433 A CA405433 A CA 405433A CA 1227654 A CA1227654 A CA 1227654A
- Authority
- CA
- Canada
- Prior art keywords
- magnet
- magnets
- strength
- magnetic
- locking
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B27/00—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/0038—Operating or controlling locks or other fastening devices by electric or magnetic means using permanent magnets
- E05B47/0043—Mechanical locks operated by cards having permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
- H01F7/0242—Magnetic drives, magnetic coupling devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Lock And Its Accessories (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Adornments (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
- Dc Machiner (AREA)
- Connections Arranged To Contact A Plurality Of Conductors (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Buckles (AREA)
- Discharge Heating (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Burglar Alarm Systems (AREA)
- Walking Sticks, Umbrellas, And Fans (AREA)
- Magnetic Treatment Devices (AREA)
Abstract
ABSTRACT
A locking mechanism actuated by a magnetic key is provided with an optimum number of combinations by providing locking magnets with a stronger magnetic field at one end than at the other end . The tendency for one magnet to influence the movement of any adjacent magnet is thus reduced, thereby permitting the coding magnets to be placed closer together and increasing the number of possible combinations within a given area.
A locking mechanism actuated by a magnetic key is provided with an optimum number of combinations by providing locking magnets with a stronger magnetic field at one end than at the other end . The tendency for one magnet to influence the movement of any adjacent magnet is thus reduced, thereby permitting the coding magnets to be placed closer together and increasing the number of possible combinations within a given area.
Description
~22~ it MAGNETIC LOCKING PINS FOR l,OCKSEI'S
This invention relates to magnetic key operated locks. Although the-invention is adapted for use with lock-in mechanisms actuatable by magnetic keys of different configurations it will be described with respect to lock-in mechanisms operable by a relatively flat card key.
Examples of the type of locking mechanism which lends itself to use with the present invention are shown in U.S.
patents numbers 37995,460 and 4,133,194.
lo The locking mechanisms disclosed in the above noted prior art include a sliding block provided with a plurality or bores or recesses in winch cylindrical shaped magnets are slid ably received. When the mechanism is locked these magnets are attracted to a position in which they enter corresponding holes in a fixed locking plate thus preventing sliding unlocking movement of the block until a proper magnetic key is inserted in the mechanism to repel the magnets out of the locking plate holes.
Heretofore, the spacing between usable holes in the sliding block has been required to be relatively large due to interaction between adjacent magnets. It has been necessary to space adjacent magnets sufficiently far apart so that movement of one magnet does not cause corresponding movement of an adjacent magnet or the proximity of magnets could prevent desired movement of one or more of them.
Naturally this limits the number of magnets that may be employed within a given area and reduces the possible number of code combinations.
The main object of the present invention is to improve magnetic key operated locking devices by permitting adjacent magnets to be placed closer together than has heretofore been possible.
Other objects and advantages will be apparent from the following specification and drawings:
~227~
Fig. 1 is a fragmentary cross section of a magnetic card key locking mechanism in locked position .
Fig. PA is a greatly enlarged view of a portion of a structure similar Jo Fig. 1 with the nonmagnetic cover plate and attracting shield plate shown in elevation to simplify the drawing.
Fig. 2B is similar to PA showing another card and magnet action.
Fig. 3 is a similar view of a portion of the structure of Fig. PA with the card key inserted and showing the result of incorporating magnets made in accordance with the invention.
Fig. 4 is a schematic showing one method of magnetize in a locking magnet in accordance with the invention.
In Fig. 1 a portion of a magnetic card key operated locket is shown including a nonmagnetic slid able block or core 10 in which are formed a plurality of transversely extending bores 12 in which are slid ably received elongated cylindrical magnets 14. Alongside core 10 is a stationary nonmagnetic locking plate 16 formed with holes 18 into which the adjacent ends of magnets 14 are adapted to be received to prevent downward movement of core 10 when the locket is in locked condition.
Positioned next to locking plate 16 is a fixed non magnetizable cover plate 20 which is interposed between locking plate 16 and a fixed magnetizable shield plate 22. This shield plate aids in magnetically anchoring the magnets within holes 18 when the locket is locked.
In Fig. PA the above noted structure is shown in greater detail with the distance between adjacent bores 12 relatively closer than shown in Fig. 1.
If it is assumed that magnets 14 are magnetized in Jo I
I conventlonnl manner with the end surfaces ox equal nod oppo~lte
This invention relates to magnetic key operated locks. Although the-invention is adapted for use with lock-in mechanisms actuatable by magnetic keys of different configurations it will be described with respect to lock-in mechanisms operable by a relatively flat card key.
Examples of the type of locking mechanism which lends itself to use with the present invention are shown in U.S.
patents numbers 37995,460 and 4,133,194.
lo The locking mechanisms disclosed in the above noted prior art include a sliding block provided with a plurality or bores or recesses in winch cylindrical shaped magnets are slid ably received. When the mechanism is locked these magnets are attracted to a position in which they enter corresponding holes in a fixed locking plate thus preventing sliding unlocking movement of the block until a proper magnetic key is inserted in the mechanism to repel the magnets out of the locking plate holes.
Heretofore, the spacing between usable holes in the sliding block has been required to be relatively large due to interaction between adjacent magnets. It has been necessary to space adjacent magnets sufficiently far apart so that movement of one magnet does not cause corresponding movement of an adjacent magnet or the proximity of magnets could prevent desired movement of one or more of them.
Naturally this limits the number of magnets that may be employed within a given area and reduces the possible number of code combinations.
The main object of the present invention is to improve magnetic key operated locking devices by permitting adjacent magnets to be placed closer together than has heretofore been possible.
Other objects and advantages will be apparent from the following specification and drawings:
~227~
Fig. 1 is a fragmentary cross section of a magnetic card key locking mechanism in locked position .
Fig. PA is a greatly enlarged view of a portion of a structure similar Jo Fig. 1 with the nonmagnetic cover plate and attracting shield plate shown in elevation to simplify the drawing.
Fig. 2B is similar to PA showing another card and magnet action.
Fig. 3 is a similar view of a portion of the structure of Fig. PA with the card key inserted and showing the result of incorporating magnets made in accordance with the invention.
Fig. 4 is a schematic showing one method of magnetize in a locking magnet in accordance with the invention.
In Fig. 1 a portion of a magnetic card key operated locket is shown including a nonmagnetic slid able block or core 10 in which are formed a plurality of transversely extending bores 12 in which are slid ably received elongated cylindrical magnets 14. Alongside core 10 is a stationary nonmagnetic locking plate 16 formed with holes 18 into which the adjacent ends of magnets 14 are adapted to be received to prevent downward movement of core 10 when the locket is in locked condition.
Positioned next to locking plate 16 is a fixed non magnetizable cover plate 20 which is interposed between locking plate 16 and a fixed magnetizable shield plate 22. This shield plate aids in magnetically anchoring the magnets within holes 18 when the locket is locked.
In Fig. PA the above noted structure is shown in greater detail with the distance between adjacent bores 12 relatively closer than shown in Fig. 1.
If it is assumed that magnets 14 are magnetized in Jo I
I conventlonnl manner with the end surfaces ox equal nod oppo~lte
2 magnet led strengths lndlcnted by N nod S then when the nuts
3 ore relntlvely close togettler there is a magnetic attraction he-tweet the north pole of each msgn~t and the south pole ox the 5 adjacent magnet as lndlcnted by the full fine arrows in Fig. PA.
The undesirable result ox this is that if a properly coded card key 24 is inserted in the locket and such key is provided with two 8 magnetic north pole spots I to repel both the upper and lower agents out of the locking plate 16 then either the upper en lower l magnet may remain In looking position due to the stronger action o I the adjacent magnet. This lnternctlon of closely adjacent magnets 12 prevents the lock from brink opened ho a properly coded key.
13 In a reverse situation, a shown in Fix. 2B, when the 14 upper and lower magnets of Fig. PA have dissimilar poles entering 15 the looking plate 16 the adjacent ends of the magnets attract each 16 other thus magnetically locking them together In parallel, nod if 17 one mnRnet is repelled by a card spot the other magnet also moves o 18 unlocking position without a repelling spot and the lock my be 19 opened by an incorrectly cooed card.
Another result of having conventionally magnetized 21 magnets too close together is that, after a plurality of adjacent 22 magnets have been repelled into core I by a properly magnetized 23 ma~netlc card key they may not all return to their looking posltio 24 In looking plate 16 after the key has been removed despite the 25 attraction of shield pinto 22.
26 By the present invention the above noted undesirable 27 result are substantially eliminated by greatly reducing the 28 intensity ox magnetization of the end of each magnet that is 29 opposite the end that cooperates with loc~lng plate 16. Thus 30 as seen in Fig. 3 the surfaces of the inner ends ox the magnets 31 are labeled "s-' to indicate a lesser intensity of magnetization 32 than the opposite end. The reduced mutual attraction of the pins I :
. I
- .
; t ~,-~
l 19 represented by dotted fine arrows in Fig. I. The incorrectly 2 coded key 29 ox Fig. repel 18 the upper magnet 14 but the lower 3 magnet being Utile Effected by the upper one remains in locked position.
S One method of obtaining this result Is schemntlcally indicated in Fig. 4. The full strength magnet 14 is preferably ox . alnlco 6 grade material and is first msgnetlcnlly connected to 8 another magnet I of somewhat stronger field strength than ~flgnet 14, nod preferably ceramic. For example, if the strength of etch 10 pole of magnet 14 is about 50n gauss then the strength of each 11 pole of ceramic magnet I should preferably be about 600 guy.
12 A strong magnetizing field 18 then applied to the upper 13 south pole ox magnet 14 by 8 capacitance discharge device which 14 includes n core I and windings I This sort of device is 15 disclosed in U.S. Potent Jo. 4,1~8,851 and is lured so as to 16 provide a collapsing field to reverse the polarity of the upper 17 pole of magnet 14 from south to north no seen in Fig. 5.
18 However, it has been found that such 8 magnetislng field, 19 although of sufficient strength to reverse the original polarity o 20 the upper south pole, has a substantially reduced effect on the 21 opposite pole which in Fig. 5 is labeled "s" to indicate its 22 relative weakness.
23 in the example given above the polarity reversal may 24 result in creation of a new north pole ox about 450 gauss while 25 the opposite south pole attains a pole strength of 20() gnus 26 or less.
27 The reason or the above noted result is believed to he 28 that, although the electrical charges which create the new north 29 pole are intensely concentrated on the surface of the upper end -- 30 of magnet 14, the charges of opposite polarity which tend to 31 create n south pole at the opposite lower end ore scattered or 32 nullified within the magnet and therefore tend not to creates strop g I
?
l concentrated field. This result ap~nrently is due to the fact 2 tort the ln~luence of the collnpslng lulled at the upper end ox 3 the manicotti tends to travel through the magnet to the lower end
The undesirable result ox this is that if a properly coded card key 24 is inserted in the locket and such key is provided with two 8 magnetic north pole spots I to repel both the upper and lower agents out of the locking plate 16 then either the upper en lower l magnet may remain In looking position due to the stronger action o I the adjacent magnet. This lnternctlon of closely adjacent magnets 12 prevents the lock from brink opened ho a properly coded key.
13 In a reverse situation, a shown in Fix. 2B, when the 14 upper and lower magnets of Fig. PA have dissimilar poles entering 15 the looking plate 16 the adjacent ends of the magnets attract each 16 other thus magnetically locking them together In parallel, nod if 17 one mnRnet is repelled by a card spot the other magnet also moves o 18 unlocking position without a repelling spot and the lock my be 19 opened by an incorrectly cooed card.
Another result of having conventionally magnetized 21 magnets too close together is that, after a plurality of adjacent 22 magnets have been repelled into core I by a properly magnetized 23 ma~netlc card key they may not all return to their looking posltio 24 In looking plate 16 after the key has been removed despite the 25 attraction of shield pinto 22.
26 By the present invention the above noted undesirable 27 result are substantially eliminated by greatly reducing the 28 intensity ox magnetization of the end of each magnet that is 29 opposite the end that cooperates with loc~lng plate 16. Thus 30 as seen in Fig. 3 the surfaces of the inner ends ox the magnets 31 are labeled "s-' to indicate a lesser intensity of magnetization 32 than the opposite end. The reduced mutual attraction of the pins I :
. I
- .
; t ~,-~
l 19 represented by dotted fine arrows in Fig. I. The incorrectly 2 coded key 29 ox Fig. repel 18 the upper magnet 14 but the lower 3 magnet being Utile Effected by the upper one remains in locked position.
S One method of obtaining this result Is schemntlcally indicated in Fig. 4. The full strength magnet 14 is preferably ox . alnlco 6 grade material and is first msgnetlcnlly connected to 8 another magnet I of somewhat stronger field strength than ~flgnet 14, nod preferably ceramic. For example, if the strength of etch 10 pole of magnet 14 is about 50n gauss then the strength of each 11 pole of ceramic magnet I should preferably be about 600 guy.
12 A strong magnetizing field 18 then applied to the upper 13 south pole ox magnet 14 by 8 capacitance discharge device which 14 includes n core I and windings I This sort of device is 15 disclosed in U.S. Potent Jo. 4,1~8,851 and is lured so as to 16 provide a collapsing field to reverse the polarity of the upper 17 pole of magnet 14 from south to north no seen in Fig. 5.
18 However, it has been found that such 8 magnetislng field, 19 although of sufficient strength to reverse the original polarity o 20 the upper south pole, has a substantially reduced effect on the 21 opposite pole which in Fig. 5 is labeled "s" to indicate its 22 relative weakness.
23 in the example given above the polarity reversal may 24 result in creation of a new north pole ox about 450 gauss while 25 the opposite south pole attains a pole strength of 20() gnus 26 or less.
27 The reason or the above noted result is believed to he 28 that, although the electrical charges which create the new north 29 pole are intensely concentrated on the surface of the upper end -- 30 of magnet 14, the charges of opposite polarity which tend to 31 create n south pole at the opposite lower end ore scattered or 32 nullified within the magnet and therefore tend not to creates strop g I
?
l concentrated field. This result ap~nrently is due to the fact 2 tort the ln~luence of the collnpslng lulled at the upper end ox 3 the manicotti tends to travel through the magnet to the lower end
4 but I repelled and neutralized by the strong mngnetlc field of
5 the permanent magnet I
6 sty mngnetR thus polarized will no longer be attracted
7 to the magnet I but will adhere to the adjacent end of
8 magnetizing core I allo~ln~ the magnets to he ensoul placed end
9 to end in a holder similar to a cocktnll strew. Stored in this lo manner the magnet Or properly selected material and dimensions If Jill not change their maRnetlc strengths appreciably and may then 12 be loaded into blocks such no shown at in in Fits. lo By 13 providing the strong end of each magnet with n selected color, the 14 polarity and the strong end may be readily identified.
When magnets of about .100 inch in diameter and .215 inch 16 long are magnetized as above described they can be placed very 17 close together at approximately 7/82" centers and York very 18 effectively in complex metric systems in mechnnlsms of the type 19 disclosed in my U.S. Patent No. 4,1~,194.
It will be understood that although in the above noted 21 example the reversal of poles was from south to north a similar 22 but opposite procedure applies when a north pole I to he 23 reversed to south.
, 225 I
When magnets of about .100 inch in diameter and .215 inch 16 long are magnetized as above described they can be placed very 17 close together at approximately 7/82" centers and York very 18 effectively in complex metric systems in mechnnlsms of the type 19 disclosed in my U.S. Patent No. 4,1~,194.
It will be understood that although in the above noted 21 example the reversal of poles was from south to north a similar 22 but opposite procedure applies when a north pole I to he 23 reversed to south.
, 225 I
Claims (7)
1. In a locking mechanism that includes a pair of magnets in side by side spaced apart relationship the improvement that comprises:
one pair of corresponding ends of said magnets each being magnetized to provide a magnetic field of relatively low strength with the opposite pair of corresponding ends being magnetized to provide magnetic fields of relatively high strength.
one pair of corresponding ends of said magnets each being magnetized to provide a magnetic field of relatively low strength with the opposite pair of corresponding ends being magnetized to provide magnetic fields of relatively high strength.
2. A mechanism according to claim 1 wherein said magnets are arranged with their longitudinal axis substantially parallel, and means supporting said magnets for longitudinal movement.
3. A mechanism according to claim 1 wherein said mechanism includes a slidable core, said magnets being slidably supported in said core.
4. The method of magnetizing a locking magnet for use in a magnetic card key operated lockset comprising the steps of:
providing a locking magnet having its opposite ends magnetized to provide north and south poles of substantially equal strength, magnetically connecting one end of said locking magnet to a second magnet at the pole of said second magnet that is opposite to the pole of said ore end, applying a magnetic field to the opposite end of said locking magnet and collapsing said field to reverse the polarity of said opposite end, whereby the strength of the magnetic pole at said one end of said locking magnet becomes relatively weak compared to the strength of the pole at said opposite end.
providing a locking magnet having its opposite ends magnetized to provide north and south poles of substantially equal strength, magnetically connecting one end of said locking magnet to a second magnet at the pole of said second magnet that is opposite to the pole of said ore end, applying a magnetic field to the opposite end of said locking magnet and collapsing said field to reverse the polarity of said opposite end, whereby the strength of the magnetic pole at said one end of said locking magnet becomes relatively weak compared to the strength of the pole at said opposite end.
5. The method of claim 4 wherein the magnetic field strength of said second magnet is stronger than the field strength of the adjacent pole of said looking magnet.
6. In a magnetic key operated locking mechanism that includes a slidable core moveable from a locked position to an unlocking position by a properly coded magnetic key and formed with a plurality of recesses each containing a magnetized pin with each of said pins being slidable along said recesses between locking and unlocking positions, the improvement that comprises, one pair of corresponding ends of said magnets each being magnetized to provide a magnetic field of relatively low strength with the opposite pair of corresponding ends being magnetized to provide magnetic fields of relatively high strength.
7. A magnetic key operated locking mechanism according to claim 6 wherein the corresponding ends of said magnets inwardly of said recesses are of relatively low strength.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27597981A | 1981-06-22 | 1981-06-22 | |
| US275,979 | 1981-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1227654A true CA1227654A (en) | 1987-10-06 |
Family
ID=23054622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000405433A Expired CA1227654A (en) | 1981-06-22 | 1982-06-17 | Magnetic locking pins for locksets |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP0068988B1 (en) |
| JP (1) | JPS584070A (en) |
| KR (1) | KR910002019B1 (en) |
| AT (1) | ATE15521T1 (en) |
| AU (1) | AU549917B2 (en) |
| CA (1) | CA1227654A (en) |
| DE (2) | DE68988T1 (en) |
| ES (1) | ES8307327A1 (en) |
| HK (1) | HK61187A (en) |
| MX (1) | MX156554A (en) |
| PH (1) | PH22562A (en) |
| SG (1) | SG33587G (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU570031B2 (en) * | 1983-03-17 | 1988-03-03 | Lowe & Fletcher Limited | Magnetising apparatus |
| DE19807663A1 (en) * | 1998-02-24 | 1999-09-09 | Baur | Connection means for releasably connecting a first component and a second component and method for releasing a connection of a first component and a second component |
| US6588811B1 (en) * | 2002-12-03 | 2003-07-08 | Edward B. Ferguson | Reversible magnetic door stop/latch |
| US8540292B2 (en) | 2002-12-03 | 2013-09-24 | Edward B. Ferguson | Reversible magnetic door stop/latch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4133194A (en) * | 1976-12-02 | 1979-01-09 | Bruce S. Sedley | Magnetic key operated door lock |
| CH620492A5 (en) * | 1977-07-25 | 1980-11-28 | Fichtel & Sachs Ag | Magnetically actuable rotary cylinder lock, key and method and device for the magnetic coding of the key |
-
1982
- 1982-05-26 JP JP57089598A patent/JPS584070A/en active Granted
- 1982-06-16 MX MX193184A patent/MX156554A/en unknown
- 1982-06-17 CA CA000405433A patent/CA1227654A/en not_active Expired
- 1982-06-17 KR KR8202700A patent/KR910002019B1/en active
- 1982-06-18 AT AT82401109T patent/ATE15521T1/en not_active IP Right Cessation
- 1982-06-18 DE DE198282401109T patent/DE68988T1/en active Pending
- 1982-06-18 EP EP82401109A patent/EP0068988B1/en not_active Expired
- 1982-06-18 DE DE8282401109T patent/DE3266179D1/en not_active Expired
- 1982-06-18 ES ES513264A patent/ES8307327A1/en not_active Expired
- 1982-06-22 AU AU85089/82A patent/AU549917B2/en not_active Ceased
- 1982-06-22 PH PH27469A patent/PH22562A/en unknown
-
1987
- 1987-04-10 SG SG33587A patent/SG33587G/en unknown
- 1987-08-20 HK HK611/87A patent/HK61187A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03477B2 (en) | 1991-01-08 |
| AU8508982A (en) | 1983-01-06 |
| EP0068988B1 (en) | 1985-09-11 |
| MX156554A (en) | 1988-09-09 |
| JPS584070A (en) | 1983-01-11 |
| SG33587G (en) | 1987-07-17 |
| DE3266179D1 (en) | 1985-10-17 |
| HK61187A (en) | 1987-08-28 |
| ES513264A0 (en) | 1983-07-01 |
| EP0068988A1 (en) | 1983-01-05 |
| ES8307327A1 (en) | 1983-07-01 |
| PH22562A (en) | 1988-10-17 |
| AU549917B2 (en) | 1986-02-20 |
| ATE15521T1 (en) | 1985-09-15 |
| KR910002019B1 (en) | 1991-03-30 |
| DE68988T1 (en) | 1983-05-11 |
| KR840000725A (en) | 1984-02-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |