Patent US3850791A successfully refreshed from Google Patents.
US3850791A
Expired / Lapsed
US
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Asbestos-based friction material
Assignee: Federal Mogul Friction Products Ltd
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Filing: 1974-03-20
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Granted: 1974-11-26
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Expires: 1994-03-20
Abstract
Abstract An asbestos-based paper or board material has a fibrous component which includes from 0.8 to 25% by weight of amosite asbestos and 6 to 96% by weight of chrysotile asbestos, based on the total weight of the material, and is particularly useful for the manufacture of friction materials comprising from 20 to 40% by weight of a bonding agent and from 60 to 80% by weight of the asbestos-based paper or board material. The paper may additionally comprise organic fibre and inorganic filler other than asbestos.
Inventors
- 👤 M Guittard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:17
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/42; D21H5/00; D21H5/12; D21H5/18; D21H5/183; F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A FRICTION MATERIAL COMPRISING A PAPER OR BOARD MATERIAL IMPREGNATED WITH A SYNTHETIC THERMOSET RESIN, WHEREIN SAID PAPER OR BOARD MATERIAL CONSTITUTES FROM 60 TO 80% BY WEIGHT OF THE FRICTION MATERIAL AND SAID RESIN CONSTITUTES FROM 20 TO 40% BY WEIGHT OF THE FRICTION MATERIAL, AND SAID PAPER OR BOARD MATERIAL CONSISTS ESSENTIALLY OF A. FROM 2 TO 20% BY WEIGHT (BASED ON THE WEIGHT OF SAID PAPER OR BOARD MATERIAL) OF AMOSITE ASBESTOS; B. FROM 6 TO 96% BY WEIGHT OF CHRYSOTILE ASBESTOS; C. FROM 0 TO 90% BY WEIGHT OF AN ORGANIC FIBRE; AND D. FROM 0 TO 20% BY WEIGHT OF AN INORGANIC FILLER OTHER THAN ASBESTOS.
Claim 2
Dependent Claim
111 words
A FRICTION MATERIAL COMPRISING A PAPER OR BOARD MATERIAL IMPREGNATED WITH A SYNTHETIC THERMOSET RESIN, WHEREIN SAID PAPER OR BOARD MATERIAL CONSTITUTES FROM 60 TO 80% BY WEIGHT OF THE FRICTION MATERIAL AND SAID RESIN CONSTITUTES FROM 20 TO 40% BY WEIGHT OF THE FRICTION MATERIAL, AND SAID PAPER OR BOARD MATERIAL CONSISTS ESSENTIALLY OF A. FROM 2 TO 20% BY WEIGHT (BASED ON THE WEIGHT OF SAID PAPER OR BOARD MATERIAL) OF AMOSITE ASBESTOS; B. FROM 6 TO 96% BY WEIGHT OF CHRYSOTILE ASBESTOS; C. FROM 0 TO 90% BY WEIGHT OF AN ORGANIC FIBRE; AND D. FROM 0 TO 20% BY WEIGHT OF AN INORGANIC FILLER OTHER THAN ASBESTOS.
Claim 3
Dependent Claim
33 words
A friction material according to claim 1, wherein said paper or board material contains less than 10% by weight of amosite asbestos, based on the total weight of the paper or board material.
Claim 4
Dependent Claim
34 words
A friction material according to claim 1, wherein said paper or board material contains from 39 to 51% by weight of chrysotile asbestos, based on the total weight of the paper or board material.
Claim 5
Dependent Claim
34 words
A friction material according to claim 1, wherein said paper or board material contains from 35 to 60% by weight of organic fibre, based on the total weight of the paper or board material.
Claim 6
Dependent Claim
34 words
A friction material according to claim 1, wherein said paper or board material contains from 5 to 10% by weight of said filler, based on the total weight of said paper or board material.
Claim 7
Dependent Claim
83 words
A friction material according to claim 1, consisting essentially of i. a paper material constituted by a. about 4% by weight of amosite asbestos (based on the weight of the paper material) b. about 25% by weight of chrysotile asbestos; c. about 34% by weight of cellulosic fibre; d. about 6% by weight of coke and 6% by weight of zinc oxide, said paper material being impregnated with ii. about 25% by weight phenol formaldehyde, based on the weight of the friction material.
Claim 8
Dependent Claim
82 words
A friction material according to claim 1, consisting essentially of i. a paper material constituted by a. about 8% by weight (based on the total weight of the paper material) of amosite asbestos, b. about 30% by weight chrysotile asbestos, c. about 23% by weight cellulosic fibre, and d. about 4% by weight mica and 4% by weight silica, said paper material being impregnated with ii. about 30% by weight of phenol formaldehyde resin based on the weight of the friction material.
Claim 9
Dependent Claim
92 words
A friction material according to claim 1, consisting essentially of i. a paper material constituted by a. about 6% by weight (based on the total weight of the paper material) of amosite asbestos, b. about 23% by weight of chrysotile asbestos, c. about 30% by weight of cellulosic fibre, and d. about 2% by weight of mica, about 2% by weight of iron oxide and about 2% by weight of lime, said paper material being impregnated with about 35% by weight, based on the weight of the friction material, of phenol-formaldehyde resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |