GB2040384A - Clutch housing for a transmission - Google Patents

Clutch housing for a transmission Download PDF

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Publication number
GB2040384A
GB2040384A GB8000589A GB8000589A GB2040384A GB 2040384 A GB2040384 A GB 2040384A GB 8000589 A GB8000589 A GB 8000589A GB 8000589 A GB8000589 A GB 8000589A GB 2040384 A GB2040384 A GB 2040384A
Authority
GB
United Kingdom
Prior art keywords
clutch housing
bearing sleeve
release bearing
oil seal
transmission
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
GB8000589A
Other versions
GB2040384B (en
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of GB2040384A publication Critical patent/GB2040384A/en
Application granted granted Critical
Publication of GB2040384B publication Critical patent/GB2040384B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
    • F16D23/14—Clutch-actuating sleeves or bearings; Actuating members directly connected to clutch-actuating sleeves or bearings
    • F16D23/148—Guide-sleeve receiving the clutch release bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/037—Gearboxes for accommodating differential gearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3268—Mounting of sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02095—Measures for reducing number of parts or components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F16H2057/0235—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly specially adapted to allow easy accessibility and repair
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
    • F16H3/089—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)
  • General Details Of Gearings (AREA)

Abstract

A clutch housing for a transmission of an automotive vehicle, is detachably secured to a release bearing sleeve 46, an input shaft 3 is inserted into the release bearing sleeve, and an oil seal 47 is secured to the release bearing sleeve so as to seal between the release bearing sleeve and the input shaft when the release bearing sleeve is attached to the clutch housing. The sleeve 46 may be secured to the housing by a screw threaded connection or by a pressure fit (Fig. 3, not shown) and the seal may be provided with a backing plate 48. <IMAGE>

Description

SPECIFICATION Clutch housing for a transmission The present invention relates to a transmission of an automotive vehicle, and more particularly relates to a clutch housing for a transmission formed integrally with a front cover.
In general, a conventional housing of a transmission and particularly a clutch housing equipped with a clutch mechanism therein is designed to contain therein a transmission mechanism in cooperation with a transmission casing. In order to facilitate the assembly, disassembly and inspection of the transmission mechanism, or the exchange of the parts, a front cover is usually attached to the clutch housing by screw means or the like, the cover being separate from the clutch housing. An input shaft and main shaft in the transmission are journaled on the front cover at their ends. When the front cover is detached or removed from the clutch housing, it becomes possible to remove the shafts, oil seals for the shafts, bearings, and other parts from the inner of the transmission casing.
However, the assembly or inspection of the transmission is often difficult in actual practices only if the front cover is detached from the clutch housing. Therefore, it is not unusual to disassemble the whole of the transmission casing and/or the clutch housing. In such a case, it is not significant that the front cover is formed separate from the clutch housing.
Taking into consideration the foregoing, a clutch housing formed integrally with the front cover has been proposed so as to overcome such defects of the prior art clutch housing equipped with the front cover as, for example, the increase of the parts and the steps for production thereof.
It should be noted, however, that such an element as an oil seal is not durable so that it must be relatively often exchanged. In the clutch housing formed integrally with the front cover, it is extremely difficult to exchange only the oil seal. Thus, the whole of the transmission must be disassembled in order to exchange the oil seal only. Such is a troublesome problem.
Therefore, it is an object of the present invention to provide a clutch housing for a transmission of an automotive vehicle in which an oil seal can be easily exchanged.
Another object of the present invention is to provide an improved clutch housing for a transmission which can increase the meritorius effects of the clutch housing formed integrally with a front cover.
According to the present invention, a clutch housing for a transmission of an automotive vehicle includes a release bearing sleeve formed separate from the clutch housing. The release bearing sleeve is detachably provided to the clutch housing, for example, by screw means or pressure-fitting means.
An oil seal is attached onto the release bearing sleeve so as to seal between the release bearing sleeve and the input shaft when the release bearing sleeve is positioned in an opening of the clutch housing.
These and other objects, features and advantages of the present invention will become more apparent from the following description of the preferred embodiments thereof when read in conjunction with the accompanying drawings in which: Fig. is a schematic sectional view showing a transmission equipped with a clutch housing according to the present invention; Fig. 2 is an enlarged sectional view showing an essential portion of the clutch housing as shown in Fig.1; and Fig. 3 is a sectional view showing another embodiment of the present invention, corresponding to Fig.
2.
Referring to Fig. there is shown a transmission for an engine front drive type automotive vehicle according to the present invention. The clutch housing 1 is attached to an engine body (not shown). The front cover 1 b is fixedly provided onto the clutch housing 1. The transmission casing 2 is attached to the clutch housing 1 so as to define a transmission chamber. The input shaft 3 is supported at its ends by the clutch housing 1 and the transmission casing 2, respectively, through the bearings 4 and 5. The input shaft 3 has at its right end in the figure a clutch mechanism (not shown) which can be installed within the clutch housing 1,so that the input shaft 3 can be driven by the engine power. The main shaft 6 is supported by the bearings 7 and 8 in parallel to the input shaft 3.The idle shaft 9 is fixed onto the upper portion of the clutch housing 1 and the transmission casing 2. The differential gear 10 is positioned below the main shaft 6.
The input shaft 3 has the first gear 11, reverse gear 12, second gear 13, third gear 14, fourth gear 15 and over-drive gear 16, in order from the right hand, integrally formed with the input shaft 3. Except the reverse gear 12, the respective gears of the input shaft 3 are always meshed with the first gear 18, second gear 19, third gear 20, fourth gear 21 and overdrive gear 22 which are rotatably supported through the bushes 17 by the main shaft 6. The synchronizers 23, 24 and 25 are arranged between the first gear 18 and the second gear 19, between the third gear 20 and the fourth gear 21, and at a side of the over-drive gear 22, respectively.The synchronizers 23, 24, 25 each has the synchrohubs 23a, 24a, 25a attached fixedly onto the main shaft 6, the coupling sleeves 23b, 24b, 25b in spline connection therewith, and baulk rings 23c, 24c, 25c, all of which are well known in the art.By the axial movement of any one of the coupling sleeves 23b, 24b, 25, the coupling sleeve 23b becomes selectively meshed with either clutch gears 18a or 1 9a of the first gear 18 and second gear 19, another coupling sleeve 24b becoming meshed selectively with either clutch gears 20a or 21a of the third and fourth gears 20,21, and the last coupling sleeve 25b becoming selectively meshed with the clutch gear 22a of the over-drive gear 22, whereby any one of the gears 18 through 22 can be connected with the main shaft 6. The reverse gear 12 isto be meshed with the reverse gear 27 formed on the periphery of the coupling sleeve 23b through the idle gear 26 rotatably supported by the idle shaft 9 when the idle gear 26 is axially moved.
The drive gear 28 in parallel to the main shaft 6 is meshed with the drive pinion 29 formed integrally with the right end of the main shaft 6. The differential gear casing 30 is fixedly provided to the drive gear 28. The numerals 31 and 32 designate the side gears to be attached to axle means (not shown). The pinion mates 33,34 are supported by the pinion-mate shaft 35, respectively.
A system for operating the synchronizers 23, 24 and 25 will be now described. A fork rod 36 is supported at its ends by the housing 1 and the casing 2 in such a way that it can move in parallel to the main shaft 6 within a limited range. The four forks 37,38, 39,40 are attached at their one end to the fork shaft 36. The fork 38,39,40 are inserted at their other end in the fork grooves 23d, 24d, 24d of the coupling sleeves 23b, 24b, 25b of the synchronizers 23, 24, 25 so that they can move axially together with the coupling sleeves 23b, 24b, 25. The fork 37 is to move together with the idle gear 26 in the axial direction.
Each end 37a, 39a, 40a of the forks 37, 3840 extends axially so as to be positioned side by side on the shaft of the fork 38 in such a way that a channelshape end 38a of the fork 38 can hold them therein, with the shifter engaging grooves thereof.
The shifter 41 includes a cylindrical body 41 a which is rotatable around and axially movable along the shaft 42 fixed in a vertical direction in the figure.
The pawl 41 b projecting from the cylindrical body 41 a is positioned at its front end in the shifter engaging groove 45. The left end of the operation arm 43 is engaged with the arm 41c protruding in the direction perpendicular to the pawl 41b.
The striking rod 44 is arranged in a direction perpendicular to the main shaft 6 with its right end being connected through a linkage to a control lever which is usually provided near the driver's seat so that the striking rod can be rotated and axially moved by the operation of the control lever. The operational arm 43 is fixed at its base portion onto the striking rod 44 in a perpendicular direction thereto. The globular portion 43a of the operation arm 43 is engaged with the recessed front portion of the arm 41 c. Thus, the shifter 41 can be axially moved along the shaft 42 by the rotation of the striking rod 44 while it can be rotated around the shaft 42 by the axial movement of the striking rod 44.
The clutch housing 1 is equipped with the front cover 1 b formed integrally therewith. In particular, the outer race 4a of the bearing 4 for supporting the right end of the input shaft 3 and the outer race 7a of the bearing 7 for supporting the right end of the main shaft 6 are fixedly provided onto the clutch housing 1 so as to reduce the number of the parts and the assembly steps thereof.
According to the present invention, the release bearing sleeve 46 for supporting the release bearing 45 for the purpose of supporting a clutch mechanism (not shown) is formed separate from the clutch housing 1 as shown in Fig. 2. A female screw is formed on the inner face of the opening 1 a of the clutch housing 1 for inserting the input shaft 3. A male screw is formed on the base portion 46a of the release bearing sleeve 46 formed separate from the clutch housing 1. The release bearing sleeve 46 is detachably screwed onto the clutch housing 1 by means of the male and female screws in cooperation with the two flat portions (not shown) formed on the periphery thereof which are opposite to each other.The annu lar oil seal 47 is fixedly attached together with the back plate 48 therefor into the annular space defined by the stepped portion 46b in the base portion of the release bearing sleeve 46. The oil seal 47 is to avoid the oil leakage out of the clutch housing 1 by contact- ing the outer surface of the input shaft 3.
According to the above-stated structure, if the release bearing sleeve 46 is rotated in a predetermined direction to detach from the clutch housing 1, the oil seal 47 can be removed together with it from the clutch housing 1. On the contrary, if the release bearing sleeve 46 is attached to the clutch housing 1, then the oil seal 47 can be attached to the clutch housing 1 at the same time. Therefore, it is easy to replace the oil seal 47 which is not durable.
In the embodiment of Fig. 2, screw means is used for the purpose of attaching the release bearing sleeve 46. However, pressure fitting means can be used in place thereof.
Fig. 3 shows another embodiment of the present invention. The oil seal 47A sticks directly to the release bearing sleeve 49. More particularly, the periphery of the oil seal 47A sticks by heat onto the inner surface of the base portion 49a of the release bearing sleeve 49. The base portion 49a of the release bearing sleeve 49 is pressure-fitted into the opening 1 a formed on the clutching housing 1. It should be noted that any other fitting means can be used in place thereof.
According to the embodiment of Fig. 3, as soon as the release bearing sleeve 49 is detached from the clutch housing 1, the oil seal 47a can be easily removed from the release bearing sleeve 49. Thus, it is very convenient to replace the oil seal 47A if desired. In addition, the number of the parts can be reduced because the oil seal is directly attached onto the release bearing sleeve.
As can be seen from the foregoing, according to the present invention, the release bearing sleeve and the clutch housing are separately formed so that they are detachable to each other, and the oil seal is attached to the release bearing sleeve. Consequently, if the release bearing sleeve is detached from the clutch housing, the oil seal can be automatically removed from the clutch housing. As a result, it is easy to exchange an oil seal when desired.

Claims (7)

1. A clutch housing for a transmission of an automotive vehicle, equipped integrally with a front cover, comprising: a release bearing sleeve formed separate from the clutch housing, the release bearing sleeve being deteachably provided onto the clutch housing; an input shaft to be inserted into the release bearing sleeve; and an oil seal attached onto the release bearing sleeve so as to seal between the release bearing sleeve and the input shaft when the release bearing sleeve is attached to the clutch housing.
2. A clutch housing as defined in claim 1 wherein the release bearing sleeve is screwed into an opening of the clutch housing.
3. A clutch housing as defined in claim 1 wherein the release bearing sleeve is pressure-fitted into an opening of the clutch housing.
4. A clutch housing as defined in claim 1 wherein the release bearing sleeve includes a stepped portion at its base portion to define an annular space within the release bearing sleeve, and the oil seal is positioned in the annular space.
5. A clutch housing as defined in claim 4 wherein the oil seal is attached through a back plate into the annular space of the release bearing sleeve.
6. A clutch housing as defined in claim 4 wherein the oil seal sticks directly onto the inner surface of the release bearing sleeve.
7. A clutch housing as claimed in claim 1 and substantially as herein described with reference to and as illustrated in Figures 1 to 3 of the accompanying drawings.
GB8000589A 1979-01-23 1980-01-08 Clutch housing for a transmission Expired GB2040384B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP685879A JPS55100427A (en) 1979-01-23 1979-01-23 Clutch housing for change gear

Publications (2)

Publication Number Publication Date
GB2040384A true GB2040384A (en) 1980-08-28
GB2040384B GB2040384B (en) 1983-05-05

Family

ID=11649927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8000589A Expired GB2040384B (en) 1979-01-23 1980-01-08 Clutch housing for a transmission

Country Status (3)

Country Link
JP (1) JPS55100427A (en)
DE (1) DE3002007A1 (en)
GB (1) GB2040384B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166501A (en) * 1984-11-01 1986-05-08 Sterling Hydraulics Limited Sealing member
FR2629539A1 (en) * 1988-04-05 1989-10-06 Procal INTEGRATED SEALING GUIDE TUBE FOR AUTOMOTIVE VEHICLE GEARBOX RELEASE CLUTCH
FR2656395A1 (en) * 1989-12-22 1991-06-28 Procal INTEGRATED SEALING GUIDE TUBE FOR VEHICLE AUTOMOTIVE GEARBOX RELEASE CLUTCH.
FR2682441A1 (en) * 1991-10-15 1993-04-16 Procal INTEGRATED SEALING GUIDE TUBE FOR VEHICLE AUTOMOTIVE GEARBOX RELEASE CLUTCH.
EP0771965A1 (en) * 1995-11-06 1997-05-07 Societe Francaise Des Amortisseurs De Carbon Improved sealing device for tube of a shock absorber, especially a pressurized monotube damper
GB2302572B (en) * 1995-06-24 1999-06-30 Seaboard Lloyd Ltd Dynamic pressure energised u-seal
DE102004043285A1 (en) * 2004-09-08 2006-03-09 Zf Friedrichshafen Ag Portal axle for e.g. omnibus, has portal drive with output gear connected with output shaft that is connected with wheel hub, which is supported by hub carrier, where carrier and housing of drive are formed as single unit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1125776B (en) * 1960-04-02 1962-03-15 Volkswagenwerk Ag Gear change transmission for motor vehicles in group transmission design
JPS4713934U (en) * 1971-03-13 1972-10-18
US4033200A (en) * 1975-04-24 1977-07-05 Ford Motor Company Five speed overdrive transmission
GB1594181A (en) * 1977-01-31 1981-07-30 Renault Vehicle transmission assembly

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166501A (en) * 1984-11-01 1986-05-08 Sterling Hydraulics Limited Sealing member
FR2629539A1 (en) * 1988-04-05 1989-10-06 Procal INTEGRATED SEALING GUIDE TUBE FOR AUTOMOTIVE VEHICLE GEARBOX RELEASE CLUTCH
EP0336843A1 (en) * 1988-04-05 1989-10-11 PROCAL, Société anonyme dite Guide member with an integrated sealing for clutch release bearing in a motor vehicle gearbox
FR2656395A1 (en) * 1989-12-22 1991-06-28 Procal INTEGRATED SEALING GUIDE TUBE FOR VEHICLE AUTOMOTIVE GEARBOX RELEASE CLUTCH.
FR2682441A1 (en) * 1991-10-15 1993-04-16 Procal INTEGRATED SEALING GUIDE TUBE FOR VEHICLE AUTOMOTIVE GEARBOX RELEASE CLUTCH.
EP0538130A1 (en) * 1991-10-15 1993-04-21 PROCAL, Société anonyme dite Guide tube with an integrated sealing for a clutch release bearing in an automotive vehicle gearbox
US5299677A (en) * 1991-10-15 1994-04-05 Claude Caillaud Guide-tube with integral sealing for motor vehicle gearbox clutch release bearing
GB2302572B (en) * 1995-06-24 1999-06-30 Seaboard Lloyd Ltd Dynamic pressure energised u-seal
EP0771965A1 (en) * 1995-11-06 1997-05-07 Societe Francaise Des Amortisseurs De Carbon Improved sealing device for tube of a shock absorber, especially a pressurized monotube damper
WO1997017555A1 (en) * 1995-11-06 1997-05-15 Societe Française Des Amortisseurs De Carbon Improved sealing device for a shock absorber tube, particularly in a pressurised one-tube shock absorber
DE102004043285A1 (en) * 2004-09-08 2006-03-09 Zf Friedrichshafen Ag Portal axle for e.g. omnibus, has portal drive with output gear connected with output shaft that is connected with wheel hub, which is supported by hub carrier, where carrier and housing of drive are formed as single unit

Also Published As

Publication number Publication date
DE3002007C2 (en) 1989-01-05
DE3002007A1 (en) 1980-07-31
GB2040384B (en) 1983-05-05
JPS55100427A (en) 1980-07-31

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930108