CA1157907A - Ignition distributors for internal combustion engines - Google Patents
Ignition distributors for internal combustion enginesInfo
- Publication number
- CA1157907A CA1157907A CA000319548A CA319548A CA1157907A CA 1157907 A CA1157907 A CA 1157907A CA 000319548 A CA000319548 A CA 000319548A CA 319548 A CA319548 A CA 319548A CA 1157907 A CA1157907 A CA 1157907A
- Authority
- CA
- Canada
- Prior art keywords
- rotary member
- shaft
- base
- sensor
- distributor according
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
- F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
- F02P7/061—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle pick-up devices without mechanical contacts
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
IGNITION DISTRIBUTORS FOR INTERNAL
COMBUSTION ENGINES
ABSTRACT
A breakerless distributor for an internal combustion engine comprises a base, a shaft adapted to be driven by an engine and extending within the base, a rotary member rotatable by the shaft, an electronic means cooperating with the rotary member to produce timing pulses. According to one feature of the invention, the electronic means is in the form of a transmitter and sensor unit removably secured in an aperture in the base, the aperture being so positioned and dimensioned that the unit can be removed from the base without removal of the shaft or rotary member from the base.
According to a further feature, centrifugal means in the form of a pair of weights is interposed between the shaft and the rotary member to advance the rotary member relative to the shaft as the shaft speed increases. Each weight is eccentrically mounted on a respective pivot on top of the rotary member, and a rotor assembly having a central input terminal and spaced peripheral output terminals is secured to rotate with the rotary member by means of a pair of screws each received in a screw threaded bore of a respective pivot thus providing a construction which is simple and cheap to manufacture and easily accessible for servicing.
COMBUSTION ENGINES
ABSTRACT
A breakerless distributor for an internal combustion engine comprises a base, a shaft adapted to be driven by an engine and extending within the base, a rotary member rotatable by the shaft, an electronic means cooperating with the rotary member to produce timing pulses. According to one feature of the invention, the electronic means is in the form of a transmitter and sensor unit removably secured in an aperture in the base, the aperture being so positioned and dimensioned that the unit can be removed from the base without removal of the shaft or rotary member from the base.
According to a further feature, centrifugal means in the form of a pair of weights is interposed between the shaft and the rotary member to advance the rotary member relative to the shaft as the shaft speed increases. Each weight is eccentrically mounted on a respective pivot on top of the rotary member, and a rotor assembly having a central input terminal and spaced peripheral output terminals is secured to rotate with the rotary member by means of a pair of screws each received in a screw threaded bore of a respective pivot thus providing a construction which is simple and cheap to manufacture and easily accessible for servicing.
Description
1 157~0~7 This invention relates to ignition distributors for internal combustion engines.
In recent years there have been many proposals for replacing the contact breaker points traditionally used in ignition distributors with "breakerless" systems which act to detect engine timing by means of magnetic or optional pick-ups cooperating with slots or other discontinuities is a member driven by a distributor shaft. Several such systems are in commercial use and provide a satisfactory performance; however, these are largely based on minimal modification of conventional distributor designs, and the possibility of exploiting the advent of breakerless systems to simplify and cheapen distributor design has not been exploited.
There have also been proposals for a more radical approach to i.c. engine ignition by using electronic sensors and processing to replace centrifugal and vacuum mechanisms in the variation of timing. The cost and complexity of such an approach is at present unacceptably high for volume pro-dUction.
According to the present invention, there is pro-vided an ignition distributor including a base, a distributor cap closing the base and having a central h.t. input and spaced peripheral h.t. outputs, a rotor assembly for sequen-tially providing an h.t. path between the inputs and the outputs, a shaft adapted to be driven by an engine and exten-ding within the base, a transmitter and a sensor positioned within the base, a rotary member rotatable by the shaft between the transmitter and the sensor and formed with ,, '~
discontinuities modifying the passage of radiation between the transmitter and the sensor, and centrifugal means inter-posed between the shaft and the rotary member to advance the rotary member relative to the shaft as the shaft speed increases, and in which the transmitter and the sensor are formed as a unit and the base is formed with an aperture positioned and dimensioned to permit the unit to be secured in and removed from the base without removing the shaft or the rotary member from the base.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying draw-ings, in which:
Figure 1 is an exploded perspective view of a dis tributor embodying the invention;
Figure 2 is an assembled view of certain parts of Figure 1, shown in longitudinal cross section;
Figure 3 is a plan view of a shaft assembly of Figure l; and Figure 4 is a scrap sectional view on the line 4-4 of Figure lo I IS7~
~, .
The distrlbutor includes a ~)a~e lO, a ;llart a.;sem~l,; lf,7 a rotor a~embly 18 a distributor cap 20, a VaCUUlil :LCtUator 2'), a sensor unit 24, an~ an electronic~ ~rno~ule ;?',.
rrhe distributor op0rates in conjunction with a conventiorlal ignition coil (not shown~. The low tensic)rl side of' the coil is controlled by the electronics module 26 which ~l~rives its timing information from the sensor uni-t 24~ 1`he sensor 11~3'it 24 as will be described in more detail, i3 a magnetic sensor cooperating with a rotating slotted vane 28.
With particular reference to ~ c 2 wh~c~h shows the relationship o~ the bo~y 10~ shaft assembl~y 1G qn~ rotor assembly 1~, the shaft assembly comprises a snaft ~0 journ~lled in the bo~ lO b,y 3 bearing 32. A drive pinion 34 is secured to the lower end of the shaft 30 by a pin 36. ~he lower end of' the housing 10 is secured to an engine in known ~anner, and the drive pinion 34 i~ driverl From the engire in the usual wa,y. The slotted vane 28 is rotatably mounted on the sha~t 30 by ~ean~ of a bearing 38. Centrif'ugal waight. ~0 (see also ~ gure 3) are mounted on pi-vots 42 secured by peeningr to a plate 44 which is al~o carried by the bearing 38. The weigilts ~0 have c~
surface~ 40a which bear on an arm 45 secured t.o the shaft 30. Outward moveme~t of the weights 40 i5 ~ e8trained by a primary and a ~econdary return spring 46, 48 respectively each exer-ting tension between a post cn the arm 45 and an upturned tab on the plate 44~ 'rhus~ as the speed of the shaft 30 rises, the weigh-ts 40 mo~e ou-tward~y agai.nst -the bias of the return spring~ andt by r3 camming action of the surfaces 40a against -the arm 45, advance the vane 2~ relatlve to the shaft 30 11~7~30~
Thls constructiorl is simple an~l c:hl:ap to man~ ct~ e, ~nd the position of the centrif-lgal weights and sl)rin~r~ on top o~ t~le vane gives ease of acc~ss for lut)rication.
The distributor cap 20 is of conven-tional form, having a central high tension input and e~uiscaped periphera~ h.t~ OUtpUtf,.
The rotor assembly 1~ comprises a plastics rotor 70 carrying a metallic strip 72 for conducting h.t. oulrent from -the C;:LD inpllt to its outputs sequentially. rrhe rotor assembly is a.rrarlged for move-ment with the vane 28, and for this purpose -is se(ureil thereto by means of screws 74 passing through the a~embly 1& to engage in ~crew threa~
formed in the weight pivots 42. T}le use of the plVOtS lo receive the æcrews 74 save6 Rpace on the top o~ ttle sha~`t ~s~e~ly lf~ an~l this allows larger centrifugal weights to be used for a ~lvcrl o~erall size of distributor and consequently a better control of advance and retard characteri~tics.
~ he sensor unit (Figure ~) comprlses a permanerlt m~lt-~et 50 and a Hall effect drvice sensor positioned radlally outwardly of the magn~t 50. Pole pieces 54 ara provided to form a tnagnetic retllrn path. The vane 28 rotates between the magnet 'jO and the sensor ')2.
As each slot of the vane 28 passes between the~, tne magnetic flux pa88ing through the sensor 52 increases sharply, producing an output pulse which is procesced by amplifying and swltcllint.r circuits in -the electronics ~odule 26 to control the l.t. supply to -the coil. Such proces~ing circuitry is well known in the art an(l will not be described7 I lS790t~
The sensor uni-t 24 is mounted to the underside of a mounting plate 56 in the position indicated in broken lines in Fig~re l, The mounting plate 56 is journalled for movement through ~l arc on the outer peripheral surface of the bearing 32 ~nd is secured thereon by a washer 58 and circlip 60. The mounting plate 56, and thus the sensor unit 24, is moved in advance and retard directions around -the shaft 30 by the vacuum actuator 22.
Th~ base 10 has a flat transverse portion 12 adJacent the bearing 32, which portion is apertured at 62~ The aperture o2 is aligned with the rest position ol` the sensor unit 24 and has a ~hape commensurate with but slightl,y larger than the underneath plan view of the sensor unit 24~ The latter m~ therefore bs inserted into and remo~ed from the ba~e in a direction parallel to the ~haft 28 withou-t removing any of the other parts, and secured in position for example by screws (not shown) driven lnto tapped bores 64 in the mounting plate, or by means of a snap fit. The electronics rnodule 26 is sui'ably fa~tened to the base portion 12 -to cover the aperture o2.
Thus9 in the event of a malfunction in the electronics parks, these may be removed and replaced without disassembly of any other pzrit of th~ distributor and hence without disturbance of the ignition timing.
The sensor unit 24 and module 26 are interconnected by cables 64 pas~ing through the aperture 62.
The invention may~ of course~ equally be applied to a distributor in ~hich the sen~or uni-t ~nd ~ane or other rotary member take different forms. The essential feature is that an engine-driven -- 7 ~
member rotates between a transmit~er and a sensor of radiation, said member ha~ing discontinuities for identifying engine timing. Thus, the transmitter may be a light source and the receiver a light-sensitive device, the rotary member being slotted or for~ed with opaque ~nd transparent portions.
In recent years there have been many proposals for replacing the contact breaker points traditionally used in ignition distributors with "breakerless" systems which act to detect engine timing by means of magnetic or optional pick-ups cooperating with slots or other discontinuities is a member driven by a distributor shaft. Several such systems are in commercial use and provide a satisfactory performance; however, these are largely based on minimal modification of conventional distributor designs, and the possibility of exploiting the advent of breakerless systems to simplify and cheapen distributor design has not been exploited.
There have also been proposals for a more radical approach to i.c. engine ignition by using electronic sensors and processing to replace centrifugal and vacuum mechanisms in the variation of timing. The cost and complexity of such an approach is at present unacceptably high for volume pro-dUction.
According to the present invention, there is pro-vided an ignition distributor including a base, a distributor cap closing the base and having a central h.t. input and spaced peripheral h.t. outputs, a rotor assembly for sequen-tially providing an h.t. path between the inputs and the outputs, a shaft adapted to be driven by an engine and exten-ding within the base, a transmitter and a sensor positioned within the base, a rotary member rotatable by the shaft between the transmitter and the sensor and formed with ,, '~
discontinuities modifying the passage of radiation between the transmitter and the sensor, and centrifugal means inter-posed between the shaft and the rotary member to advance the rotary member relative to the shaft as the shaft speed increases, and in which the transmitter and the sensor are formed as a unit and the base is formed with an aperture positioned and dimensioned to permit the unit to be secured in and removed from the base without removing the shaft or the rotary member from the base.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying draw-ings, in which:
Figure 1 is an exploded perspective view of a dis tributor embodying the invention;
Figure 2 is an assembled view of certain parts of Figure 1, shown in longitudinal cross section;
Figure 3 is a plan view of a shaft assembly of Figure l; and Figure 4 is a scrap sectional view on the line 4-4 of Figure lo I IS7~
~, .
The distrlbutor includes a ~)a~e lO, a ;llart a.;sem~l,; lf,7 a rotor a~embly 18 a distributor cap 20, a VaCUUlil :LCtUator 2'), a sensor unit 24, an~ an electronic~ ~rno~ule ;?',.
rrhe distributor op0rates in conjunction with a conventiorlal ignition coil (not shown~. The low tensic)rl side of' the coil is controlled by the electronics module 26 which ~l~rives its timing information from the sensor uni-t 24~ 1`he sensor 11~3'it 24 as will be described in more detail, i3 a magnetic sensor cooperating with a rotating slotted vane 28.
With particular reference to ~ c 2 wh~c~h shows the relationship o~ the bo~y 10~ shaft assembl~y 1G qn~ rotor assembly 1~, the shaft assembly comprises a snaft ~0 journ~lled in the bo~ lO b,y 3 bearing 32. A drive pinion 34 is secured to the lower end of the shaft 30 by a pin 36. ~he lower end of' the housing 10 is secured to an engine in known ~anner, and the drive pinion 34 i~ driverl From the engire in the usual wa,y. The slotted vane 28 is rotatably mounted on the sha~t 30 by ~ean~ of a bearing 38. Centrif'ugal waight. ~0 (see also ~ gure 3) are mounted on pi-vots 42 secured by peeningr to a plate 44 which is al~o carried by the bearing 38. The weigilts ~0 have c~
surface~ 40a which bear on an arm 45 secured t.o the shaft 30. Outward moveme~t of the weights 40 i5 ~ e8trained by a primary and a ~econdary return spring 46, 48 respectively each exer-ting tension between a post cn the arm 45 and an upturned tab on the plate 44~ 'rhus~ as the speed of the shaft 30 rises, the weigh-ts 40 mo~e ou-tward~y agai.nst -the bias of the return spring~ andt by r3 camming action of the surfaces 40a against -the arm 45, advance the vane 2~ relatlve to the shaft 30 11~7~30~
Thls constructiorl is simple an~l c:hl:ap to man~ ct~ e, ~nd the position of the centrif-lgal weights and sl)rin~r~ on top o~ t~le vane gives ease of acc~ss for lut)rication.
The distributor cap 20 is of conven-tional form, having a central high tension input and e~uiscaped periphera~ h.t~ OUtpUtf,.
The rotor assembly 1~ comprises a plastics rotor 70 carrying a metallic strip 72 for conducting h.t. oulrent from -the C;:LD inpllt to its outputs sequentially. rrhe rotor assembly is a.rrarlged for move-ment with the vane 28, and for this purpose -is se(ureil thereto by means of screws 74 passing through the a~embly 1& to engage in ~crew threa~
formed in the weight pivots 42. T}le use of the plVOtS lo receive the æcrews 74 save6 Rpace on the top o~ ttle sha~`t ~s~e~ly lf~ an~l this allows larger centrifugal weights to be used for a ~lvcrl o~erall size of distributor and consequently a better control of advance and retard characteri~tics.
~ he sensor unit (Figure ~) comprlses a permanerlt m~lt-~et 50 and a Hall effect drvice sensor positioned radlally outwardly of the magn~t 50. Pole pieces 54 ara provided to form a tnagnetic retllrn path. The vane 28 rotates between the magnet 'jO and the sensor ')2.
As each slot of the vane 28 passes between the~, tne magnetic flux pa88ing through the sensor 52 increases sharply, producing an output pulse which is procesced by amplifying and swltcllint.r circuits in -the electronics ~odule 26 to control the l.t. supply to -the coil. Such proces~ing circuitry is well known in the art an(l will not be described7 I lS790t~
The sensor uni-t 24 is mounted to the underside of a mounting plate 56 in the position indicated in broken lines in Fig~re l, The mounting plate 56 is journalled for movement through ~l arc on the outer peripheral surface of the bearing 32 ~nd is secured thereon by a washer 58 and circlip 60. The mounting plate 56, and thus the sensor unit 24, is moved in advance and retard directions around -the shaft 30 by the vacuum actuator 22.
Th~ base 10 has a flat transverse portion 12 adJacent the bearing 32, which portion is apertured at 62~ The aperture o2 is aligned with the rest position ol` the sensor unit 24 and has a ~hape commensurate with but slightl,y larger than the underneath plan view of the sensor unit 24~ The latter m~ therefore bs inserted into and remo~ed from the ba~e in a direction parallel to the ~haft 28 withou-t removing any of the other parts, and secured in position for example by screws (not shown) driven lnto tapped bores 64 in the mounting plate, or by means of a snap fit. The electronics rnodule 26 is sui'ably fa~tened to the base portion 12 -to cover the aperture o2.
Thus9 in the event of a malfunction in the electronics parks, these may be removed and replaced without disassembly of any other pzrit of th~ distributor and hence without disturbance of the ignition timing.
The sensor unit 24 and module 26 are interconnected by cables 64 pas~ing through the aperture 62.
The invention may~ of course~ equally be applied to a distributor in ~hich the sen~or uni-t ~nd ~ane or other rotary member take different forms. The essential feature is that an engine-driven -- 7 ~
member rotates between a transmit~er and a sensor of radiation, said member ha~ing discontinuities for identifying engine timing. Thus, the transmitter may be a light source and the receiver a light-sensitive device, the rotary member being slotted or for~ed with opaque ~nd transparent portions.
Claims (15)
1. An ignition distributor including a base, a dis-tributor cap closing the base and having a central h.t. input and spaced peripheral h.t. outputs, a rotor assembly for sequentially providing an h.t. path between said inputs and said outputs, a shaft adapted to be driven by an engine and extending within the base, a transmitter and a sensor posi-tioned within the base, a rotary member rotatable by the shaft between the transmitter and the sensor and formed with discontinuities modifying the passage of radiation between the transmitter and the sensor, and centrifugal means inter-posed between the shaft and the rotary member to advance the rotary member relative to the shaft as the shaft speed increases, and in which the transmitter and the sensor are formed as a unit and the base is formed with an aperture positioned and dimensioned to permit said unit to be secured in and removed from the base without removing the shaft or the rotary member from the base.
2. A distributor according to Claim 1, in which said unit is secured to a mounting member which can be rotated relative to the shaft by a vacuum actuator adapted for connection to the inlet manifold of an enginge.
3. A distributor according to Claim 2, including a bearing mounted on the base and having a bore in which the shaft is journalled and a peripheral bearing surface on which said mounting member is journalled.
4. A distributor according to any one of Claims 1 to 3 including an electronics module electrically connected to the sensor and secured to the housing to cover said aperture.
5. A distributor according to any one of Claims 1 to 3 in which said rotary member is of inverted cup shape said discontinuities being peripheral slots, and the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft.
6. A distributor according to any one of Claims 1 to 3 including an electronic module electrically connected to the sensor and secured to the housing to cover said aperture and in which said rotary member is of inverted cup shape said discontinuities being peripheral slots, and the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft.
7. A distributor according to any one of Claims 1 to 3 in which said rotary member is of inverted cup shape said discontinuities being peripheral slots, the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft, the rotary member is arranged to be rotated relative to the shaft by centrifugal weights against the bias of return springs, and the weights and return springs are positioned on top of the rotary member.
8. A distributor according to any one of Claims 1 to 3 in which the transmitter comprises a magnet and the sensor is a magnetic flux sensor.
9. A distributor according to any of Claims 1 to 3 in which the transmitter comprises a magnet and the sensor is a Hall effect magnetic flux sensor.
10. A distributor according to any one of Claims 1 to 3 in which the rotary member is of inverted cup shape said dis-continuities being peripheral slots, the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft, the transmitter comprises a magnet and the sensor is a magnetic flux sensor.
11. A distributor according to any one of Claims 1 to 3 in which said rotary member is of inverted cup shape said discontinuities being peripheral slots, the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft, the rotary member is arranged to be rotated relative to the shaft by centrifugal weights against the bias of return springs, and the weights and return springs are positioned on top of the rotary member, the transmitter comprises a magnet and the sensor is a magnetic flux sensor.
12. A distributor according to any one of Claims 1 to 3 in which the transmitter is a light source and the sensor is a photosensitive electronic device.
13. A distributor according to any one of Claims 1 to 3 in which said rotary member is of inverted cup shape said dis-continuities being peripheral slots, and the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft, the transmitter is a light source and the sensor is a photosensitive electronic device.
14. A distributor according to any one of Claims 1 to 3 in which said rotary member is of inverted cup shape said dis-continuities being peripheral slots, the aperture in said base permits said unit to be inserted and removed from beneath in a direction parallel to the shaft, the rotary member is arranged to be rotated relative to the shaft by centrifugal weights against the bias of return springs, and the weights and return springs are positioned on top of the rotary member, the transmitter is a light source and the sensor is a photosensitive electronic device.
15. A distributor according to any one of claims 1 to 3, in which the centrifugal means comprises a pair of weights each eccentrically mounted on a respective pivot on top of the rotary member, and the rotor assembly is secured to rotate with the rotary member by means of a pair of screws each received in a screw-threaded bore of a respective pivot.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB120178A GB1597903A (en) | 1978-01-12 | 1978-01-12 | Ignition distributors for internal combustion engines |
| GB1201/78 | 1978-01-12 | ||
| GB1200/78 | 1978-01-12 | ||
| GB120078A GB1597902A (en) | 1978-01-12 | 1978-01-12 | Ignition distributors for internal combustion engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157907A true CA1157907A (en) | 1983-11-29 |
Family
ID=26236563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000319548A Expired CA1157907A (en) | 1978-01-12 | 1979-01-12 | Ignition distributors for internal combustion engines |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0009039A1 (en) |
| JP (1) | JPS55500056A (en) |
| CA (1) | CA1157907A (en) |
| FR (1) | FR2454536A1 (en) |
| WO (1) | WO1979000495A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0030078B1 (en) * | 1979-11-21 | 1986-01-29 | LUCAS INDUSTRIES public limited company | Rotor arm assembly for use in an ignition distributor incorporating a contactless signal generator for an electronic ignition system |
| DE3070589D1 (en) * | 1979-11-21 | 1985-06-05 | Lucas Ind Plc | Apparatus for use in, setting the position of a sensor of a contactless signal generator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3087001A (en) * | 1961-03-13 | 1963-04-23 | Gen Motors Corp | Breakerless ignition system |
| US3646922A (en) * | 1969-11-13 | 1972-03-07 | Thomas P Spalding | Ignition system |
| US3906920A (en) * | 1974-04-25 | 1975-09-23 | Lux Inc | Ignition apparatus and system |
-
1979
- 1979-01-10 WO PCT/GB1979/000003 patent/WO1979000495A1/en unknown
- 1979-01-10 JP JP50021779A patent/JPS55500056A/ja active Pending
- 1979-01-12 CA CA000319548A patent/CA1157907A/en not_active Expired
- 1979-08-13 EP EP19790900046 patent/EP0009039A1/en not_active Withdrawn
-
1980
- 1980-04-24 FR FR8009590A patent/FR2454536A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2454536B1 (en) | 1984-02-10 |
| EP0009039A1 (en) | 1980-04-02 |
| WO1979000495A1 (en) | 1979-08-09 |
| FR2454536A1 (en) | 1980-11-14 |
| JPS55500056A (en) | 1980-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |