GB2151728A - Floating caliper spot-type disc brake - Google Patents

Floating caliper spot-type disc brake Download PDF

Info

Publication number
GB2151728A
GB2151728A GB08429643A GB8429643A GB2151728A GB 2151728 A GB2151728 A GB 2151728A GB 08429643 A GB08429643 A GB 08429643A GB 8429643 A GB8429643 A GB 8429643A GB 2151728 A GB2151728 A GB 2151728A
Authority
GB
United Kingdom
Prior art keywords
caliper
brake
layer
pin
pin guide
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
GB08429643A
Other versions
GB2151728B (en
GB8429643D0 (en
Inventor
Rudolf Thiel
Hans Bungert
Michael Weidenweber
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.)
Continental Teves AG and Co oHG
Original Assignee
Alfred Teves GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfred Teves GmbH filed Critical Alfred Teves GmbH
Publication of GB8429643D0 publication Critical patent/GB8429643D0/en
Publication of GB2151728A publication Critical patent/GB2151728A/en
Application granted granted Critical
Publication of GB2151728B publication Critical patent/GB2151728B/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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • F16D65/095—Pivots or supporting members therefor
    • F16D65/097—Resilient means interposed between pads and supporting members or other brake parts
    • F16D65/0973—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces
    • F16D65/0974—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces acting on or in the vicinity of the pad rim in a direction substantially transverse to the brake disc axis
    • F16D65/0977—Springs made from sheet metal
    • F16D65/0978—Springs made from sheet metal acting on one pad only
    • 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
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/22655—Constructional details of guide pins
    • 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
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/007—Pins holding the braking members

Abstract

The brake comprises a brake carrier and a caliper (20) straddling a brake disc (8) and brake shoes and being axially slidable relative to said brake carrier, said brake carrier or said caliper, respectively, being provided with at least one pin (22) which is guided in a bore (14) of said caliper or of the said brake carrier, respectively, and an intermediate layer (40) is provided between pin (22) and bore (14) to prevent metallic contact therebetween. Layer (40) may be applied onto pin (22) or bore (14) and may comprise layer of sliding varnish. Alternatively it may comprise an adhesion-active sub-layer (e.g. zinc phosphate) provided directly on metal surface and onto zinc phosphate layer is then applied a layer of sliding varnish comprising dry lubricant system containing e.g. fluorocarbon, or molydenum sulphite and graphite in heat convertible resin. After curving, grease may be provided and as shown a lubricating groove (23) runs helically around pin (22). <IMAGE>

Description

SPECIFICATION A floating caliper spot type disc brake This invention relates to a floating caliper spottype disc brake and in particular to a pin guide, and a process for its manufacture, for a caliper of a floating caliper spot-type disc brake, the disc brake comprising a brake carrier and the caliper, the caliper straddling a brake disc and brake shoes and being axially slidable relative to the said brake carrier, said brake carrier or said caliper, respectively, being provided with at least one pin which is guided in a bore of the said caliper or said brake carrier, respectively.
A guide of this kind is, for example, described in the German printed and published patent application 3,323,737. In such a guide in which the forces occurring during braking action are absorbed in essence by a carrying pin, a damage of the guide areas of the pin guide and, consequently, a functional failure may happen in case of extended operation.
The present invention has, therefore, the object to improve the known pin guide in such a manner that damage of the guide areas and thus a functional failure are prevented even in case of an extended service life.
According to one aspect of the present invention, there is provided a pin guide for a caliper of a floating caliper spot-type disc brake, the disc brake comprising a brake carrier and the caliper, the caliper straddling a brake disc and brake shoes and being axially slidable relative to the said brake carrier, said brake carrier or said caliper, respectively, being provided with at least one pin which is guided in a bore of the said caliper or said brake carrier, respectively, characterised in that between the said pin and the said bore, there is provided an intermediate layer which permanently prevents any metallic contact between the pin and the bore.
According to another aspect of the present invention, there is provided a process for the manufacture of a pin guide for a caliper of a floating caliper spot-type disc brake, the brake disc comprising a brake carrier and the caliper, the caliper straddling a brake disc and brake shoes and being axially slidable relative to the said brake carrier, said brake carrier or said caliper, respectively, being provided with at least one pin which is guided in a bore of the said caliper or said brake carrier, respectively, characterised in that in a pretreatment step, one component metal part of the said guide is furnished with an adhesion-active layer, in that in a further step, a layer of sliding varnish is applied, and in that a curing takes place afterward.
The inventive solution creates a pin guide with narrow tolerances, furnished with a longlife lubrication and preserving an unrestricted operating ability over a wide temperature range from approximately -40 C to +180"C. To fulfull its function, namely to guide the caliper and to transmit the major braking forces, the guide is distinguished by a low coefficient of friction in the order of maximum 0.15 in accordance with the constructional conditions of the caliper. The formation of fretting corrosion (tribooxydation) is excluded in the inventional pin guide, as a result whereof the guide remains operable in any case, even on very long service times. As a consequence, the guide offers the further advantages of a uniform wear and, therefore, of a longer service life of the linings.
Embodiments of the invention will now be described with reference to the accompanying drawings in which: Figure 1 is a front view of a spot-type disc brake; Figure 2 is a top plan view of the spot-type disc brake shown in Figure 1, and Figure 3 is a cros-section along the line A-A through the spot-type disc brake in Figure 1.
The spot-type disc brake illustrated in the drawings is intended to be mounted in an automotive vehicle. It is furnished with a brake carrier 2 being boltable or securable in some other way to a steering knuckle, to the axle or to another structural member of the wheel suspension of the vehicle at the side of a brake disc 8 by means of mounting eys 4, 6. The brake carrier 2 is formed with two brake carrier arms 10, 12 being substantially arranged in a V-shaped configuration and provided with bores at their radially external ends, only one of which bores being visible in Figure 3. In that configuration, the forementioned bore 14 in the brake carrier arm 10 is arranged in an attachment 18 extending axially at the external end of the brake carrier arm 10.A carrying pin 22 coupled to a brake caliper 20 is axially slidably received in the bore 14 as will be described in more detail further on. In the other, not visible, bore of the brake carrier arm 12, there is secured an axially extending guide pin (not shown in the drawing) which is axially slidable in an axially directed bore provided in the brake caliper. Moreover, the pin guide system of the caliper may be conceived in that the carrying pin 22 is received in the brake carrier arm 10 and the axially slidable bore 14 provided in the brake caliper 20.
The brake caliper 20 is substantially shell-shaped and comprises a first, radially extending stem 28 forming a brake cylinder 30 which receives a brake piston (not shown in the drawing). The stem 28 is succeeded by a bridge portion 34 which straddles the brake disc 8. On its other side, the bridge portion 34 ends up in a further radially extending stem 36. Beside the brake cylinder 30, there is provided an axially extending bore 38 in the stem 28, in which bore 38 the carrying pin 22 is secured which, also extends in axial direction. With its free end projecting from the bore 38, the carrying pin 22 engages in the bore 14 of the brake carrier arm 10 and is axially slidable therein as already outlined above. The free end of the carrying pin 22 may be furnished, optionally with a lubricating groove 23 running helically around its periphery.In this context, the diameters of the carrying pin 22 and of the bore 14 are harmonised such that the carrying pin 22 forms a fixed bearing in conjunction with the bore 14. As a consequence, very narrow tolerances are necessary for the pin guide.
In between the guide constituted by the carrying pin 22 and the bore 14, there is provided an intermediate layer 40 comprising at least two component sublayers arranged one on top of the other, the intermediate layer 40 being applied onto the carrying pin 22 in the embodiment being considered but being adapted to be applied in a similar manner onto the wall of the bore 14 as an alternative. By means of that intermediate layer, any metallic contact between the component parts of the guide is permanently prevented. The intermediate layer includes an adhesion-active sub-layer which is provided directly on the metal surface and is advantageously made up of a zinc phosphate layer of 3 to 5 microns thickness.Onto that zinc phosphate layer, there is applied a layer of sliding varnish as a second sublayer, having a thickness in the range of 5 to 20 microns, expediently a thickness of 12 t 4 microns. The layer of sliding varnish comprises a dry lubricant system containing molybdenum sulphite and graphite in a heat convertible resin. Instead of molybdenum sulphite and graphite, a fluorocarbon may be utilised as an alternative.
Greasing with a special grease may be provided additionally.
The process for the manufacture of the pin guide provides that in a pretreatment step an adhesionactive sublayer of zinc phosphate is applied first of all on one component part of the guide, that is on the carrying pin 22 or on the wall of the bore 14.
Then a further layer constituted of sliding varnish is applied, succeeded by a curing step of one hour duration, expediently at a temperature of 180"C. Finally, in a last step, greasing with a special grease may be carried out.
It is, moreover, possible to apply the layer of sliding varnish directly onto the metal surface without an adhesion-active intermediate layer.

Claims (19)

1. A pin guide for a caliper of a floating caliper spot-type disc brake, the disc brake comprising a brake carrier and the caliper, the caliper straddling a brake disc and brake shoes and being axially slidable relative to the said brake carrier, said brake carrier or said caliper, respectively, being provided with at least one pin which is guided in a bore of the said caliper or said brake carrier, respectively, characterised in that between the said pin (22) and the said bore (14), there is provided an intermediate layer (40) which permanently prevents any metallic contact between the pin and the bore.
2. A pin guide as claimed in claim 1, characterised in that the said pin (22) is the main carrying pin of the brake which absorbs the major proces occurring during braking action.
3. A pin guide as claimed in claim 1 or claim 2, characterised in that the said intermediate layer (40) comprises an adhesion-active sublayer.
4. A pin guide as claimed in claim 3, characterised in that the said sublayer contains zinc phosphate.
5. A pin guide as claimed in claim 3 or claim 4, characterised in that the thickness of the said adhesion-active sub-layer is in the range 3 to 5 microns.
6. A pin guide as claimed in any one of the preceding claims, characterised in that the said intermediate layer comprises a layer of sliding varnish.
7. A pin guide as claimed in claim 3, characterised in that a layer of sliding varnish is provided in addition to the said adhesion-active sub-layen
8. A pin guide as claimed in claim 6 or claim 7, characterised in that the said layer of sliding varnish has a thickness in the range 5 to 20 microns.
9. A pin guide as claimed in claim 8, characterised in that the said layer of sliding varnish has a thickness of 12 + 4 microns.
10. A pin guide as claimed in any one of claims 6 to 9, characterised in that the said layer of sliding varnish contains molybdenum disulphite.
11. A pin guide as claimed in any one of claims 6 to 10, characterised in that the said layer of sliding varnish contains graphite.
12. A pin guide as claimed in any one of claims 6 to 9, characterised in that the said layer of sliding varnish contains a fluorocarbon.
13. A pin guide as claimed in any one of claims 6 to 12, characterised in that the said layer of sliding varnish comprises a heat convertibie resin binder.
14. A pin guide as claimed in any one of the preceding claims, characterised in that on the said intermediate layer (40), there is provided an additional greasing layer.
15. A process for the manufacture of a pin guide for a caliper of a floating caliper spot-type disc brake, the brake disc comprising a brake carrier and the caliper, the caliper straddling a brake disc and brake shoes and being axially slidable relative to the said brake carrier, said brake carrier or said caliper, respectively, being provided with at least one pin which is guided in a bore of the said caliper or said brake carrier, respectively, characterised in that in a pretreatment step, one component metal part of the said guide is furnished with an adhesion-active layer, in that in a further step, a layer of sliding varnish is applied, and in that a curing takes place afterward.
16. A process as claimedin claim 15, characterised in that the said curing is carried out at a temperature of approximately 180"C.
17. A process as claimed in claim 16, characterised in that the curing time amounts to approximately one hour.
18. A pin guide for a caliper of a floating caliper spot-type disc brake substantially as herein described with reference to the accompanying drawings.
19. A process for the manufacture of a pin guide for a caliper of a floating caliper spot-type disc brake substantially as herein described with reference to the accompanying drawings.
GB08429643A 1983-12-23 1984-11-23 Floating caliper spot-type disc brake Expired GB2151728B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3346629A DE3346629C2 (en) 1983-12-23 1983-12-23 Bolt guide for the caliper of a floating caliper disc brake and method for its manufacture

Publications (3)

Publication Number Publication Date
GB8429643D0 GB8429643D0 (en) 1985-01-03
GB2151728A true GB2151728A (en) 1985-07-24
GB2151728B GB2151728B (en) 1987-11-11

Family

ID=6217830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08429643A Expired GB2151728B (en) 1983-12-23 1984-11-23 Floating caliper spot-type disc brake

Country Status (11)

Country Link
JP (1) JPH0676813B2 (en)
AR (1) AR244291A1 (en)
BR (1) BR8406258A (en)
DE (1) DE3346629C2 (en)
ES (1) ES283534Y (en)
FR (1) FR2557239B1 (en)
GB (1) GB2151728B (en)
IT (1) IT1177463B (en)
MX (1) MX160884A (en)
SE (1) SE457470B (en)
ZA (1) ZA849687B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225070A (en) * 1988-11-12 1990-05-23 Teves Gmbh Alfred Disc brakes and method of coating sliding surfaces thereof
GB2345104A (en) * 1998-11-19 2000-06-28 Knorr Bremse Systeme A bearing device for mounting a sliding calliper of a disc brake
EP1126191A3 (en) * 2000-02-16 2004-01-02 I.B.S.-Industria Bulloneria Speciale S.r.l. A guide member
KR20140025479A (en) * 2011-05-09 2014-03-04 크노르-브렘제 시스테메 퓌어 쉬에넨파쩨우게 게엠베하 Rail wheel and method for producing a rail wheel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412062A1 (en) * 1984-03-31 1985-10-03 Alfred Teves Gmbh, 6000 Frankfurt PARTIAL DISC BRAKE
DE19626296B4 (en) * 1996-07-01 2005-11-10 Continental Teves Ag & Co. Ohg Floating caliper-type disc brake
DE19651917A1 (en) * 1996-12-13 1998-06-18 Teves Gmbh Alfred Guide bolt for floating saddle disc brake
FR2771149B1 (en) 1997-11-20 2000-04-21 Bosch Syst Freinage FLOATING CALIPER DISC BRAKE CALIPER AND METHOD FOR PRODUCING SUCH A COLUMN
CN113864366A (en) * 2021-10-13 2021-12-31 厦门峻鸿环境固废处置有限公司 Brake shoe pin, shoe anti-locking mechanism and system of garbage carrying vehicle

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1255079A (en) * 1968-06-20 1971-11-24 Dayton Steel Foundry Co Disk brakes
GB1521038A (en) * 1974-10-22 1978-08-09 Girling Ltd Sliding caliper disc brake
GB2001717A (en) * 1977-07-16 1979-02-07 Toyota Motor Co Ltd A disc brake
GB1560676A (en) * 1976-09-22 1980-02-06 Tokico Ltd Disc brake
GB1563110A (en) * 1975-08-18 1980-03-19 Tokico Ltd Disc brake
GB2031537A (en) * 1978-08-01 1980-04-23 Kelsey Hayes Co Bearings for disc brake calipr
WO1980001828A1 (en) * 1979-02-23 1980-09-04 Garlock Inc Disc brake assembly and method
GB1597778A (en) * 1977-05-20 1981-09-09 Tokico Ltd Spot-type discbrake

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2414174C2 (en) * 1974-03-23 1983-10-27 Alfred Teves Gmbh, 6000 Frankfurt Brake caliper guide for a partially lined disc brake
GB1563405A (en) * 1976-10-08 1980-03-26 Gen Motors France Disc brake caliper assembly
US4200173A (en) * 1978-08-01 1980-04-29 Kelsey-Hayes Company Sliding caliper disc brake
JPS5566227U (en) * 1978-10-30 1980-05-07
DE2931804C2 (en) * 1979-08-06 1986-06-19 Alfred Teves Gmbh, 6000 Frankfurt Guide element
JPS57134028A (en) * 1981-02-12 1982-08-19 Akebono Brake Ind Co Ltd Pin-slide type sliding support device for disk brake
US4375842A (en) * 1981-06-25 1983-03-08 General Motors Corporation Disc brake caliper piston and housing retraction and knockback control mechanism
JPS5897329U (en) * 1981-12-25 1983-07-02 富士重工業株式会社 Pin slide part structure of pin slide type disc brake
DE3245157A1 (en) * 1982-12-07 1984-06-07 Alfred Teves Gmbh, 6000 Frankfurt BRAKE CALIPER HOUSING, ESPECIALLY FOR A PARTIAL COVER DISC BRAKE OF A MOTOR VEHICLE, AND METHOD FOR PRODUCING THE HOUSING
DE3323737A1 (en) * 1983-07-01 1985-01-03 Alfred Teves Gmbh, 6000 Frankfurt BOLT GUIDE FOR THE SADDLE OF A FLOATING SADDLE PART COVER BRAKE

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1255079A (en) * 1968-06-20 1971-11-24 Dayton Steel Foundry Co Disk brakes
GB1521038A (en) * 1974-10-22 1978-08-09 Girling Ltd Sliding caliper disc brake
GB1563110A (en) * 1975-08-18 1980-03-19 Tokico Ltd Disc brake
GB1560676A (en) * 1976-09-22 1980-02-06 Tokico Ltd Disc brake
GB1597778A (en) * 1977-05-20 1981-09-09 Tokico Ltd Spot-type discbrake
GB2001717A (en) * 1977-07-16 1979-02-07 Toyota Motor Co Ltd A disc brake
GB2031537A (en) * 1978-08-01 1980-04-23 Kelsey Hayes Co Bearings for disc brake calipr
WO1980001828A1 (en) * 1979-02-23 1980-09-04 Garlock Inc Disc brake assembly and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225070A (en) * 1988-11-12 1990-05-23 Teves Gmbh Alfred Disc brakes and method of coating sliding surfaces thereof
GB2225070B (en) * 1988-11-12 1992-12-16 Teves Gmbh Alfred Disc brakes
GB2345104A (en) * 1998-11-19 2000-06-28 Knorr Bremse Systeme A bearing device for mounting a sliding calliper of a disc brake
EP1126191A3 (en) * 2000-02-16 2004-01-02 I.B.S.-Industria Bulloneria Speciale S.r.l. A guide member
KR20140025479A (en) * 2011-05-09 2014-03-04 크노르-브렘제 시스테메 퓌어 쉬에넨파쩨우게 게엠베하 Rail wheel and method for producing a rail wheel
US20140145460A1 (en) * 2011-05-09 2014-05-29 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Rail wheel and method for producing a rail wheel
KR101996097B1 (en) 2011-05-09 2019-07-03 크노르-브렘제 시스테메 퓌어 쉬에넨파쩨우게 게엠베하 Rail wheel and method for producing a rail wheel

Also Published As

Publication number Publication date
GB2151728B (en) 1987-11-11
MX160884A (en) 1990-06-07
DE3346629C2 (en) 1996-04-11
FR2557239B1 (en) 1990-08-10
DE3346629A1 (en) 1985-07-04
IT8424135A1 (en) 1986-06-19
ES283534U (en) 1985-05-01
BR8406258A (en) 1985-10-01
GB8429643D0 (en) 1985-01-03
FR2557239A1 (en) 1985-06-28
SE8406188L (en) 1985-06-24
IT1177463B (en) 1987-08-26
JPS60157524A (en) 1985-08-17
JPH0676813B2 (en) 1994-09-28
ZA849687B (en) 1985-07-31
AR244291A1 (en) 1993-10-29
ES283534Y (en) 1985-12-16
IT8424135A0 (en) 1984-12-19
SE8406188D0 (en) 1984-12-06
SE457470B (en) 1988-12-27

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19991123