Patent US1190387A successfully refreshed from Google Patents.
US4871394A
Expired / Lapsed
US
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Sintered metal friction facing
Assignee: Federal Mogul Friction Products Ltd
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Filing: 1988-11-08
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Granted: 1989-10-03
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Expires: 2008-11-08
Abstract
Abstract Sintered copper friction facing suitable for operation in oil and quieter in operation than current facing of this type has a void volume not less than 30% of the total volume. It can be made by employing, as the copper to form the facing matrix, copper powder which is in dendritic form and of apparent density not greater than 1.3 gram/cm 3 .
Inventors
- 👤 Ralph Baker
- 👤 Stephen N. Foulkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:17
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/027; B; B22; B22F; B22F1/00; B22F1/12; B22F3/00; B22F3/10; B22F3/1003; B22F3/11; B22F3/1103; B29; B29C; B29C43/00; B29C43/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A method of making a friction facing suitable for operation in oil, comprising sintering a mixture comprising a major proportion by weight of copper powder and a minor proportion by weight of friction-imparting particles, said copper powder being in dendritic form and of apparent density not greater than 1.3 gram/cm 3 , to obtain a facing having a void volume not less than 30% of the total volume.
Claim 2
Independent Claim
68 words
A method of making a friction facing suitable for operation in oil, comprising sintering a mixture comprising a major proportion by weight of copper powder and a minor proportion by weight of friction-imparting particles, said copper powder being in dendritic form and of apparent density not greater than 1.3 gram/cm 3 , to obtain a facing having a void volume not less than 30% of the total volume.
Claim 3
Dependent Claim
21 words
A method according to claim 1, in which the copper powder has an apparent density less than 1 gram/cm 3 .
Claim 4
Dependent Claim
17 words
A method according to claim 1, in which the friction-imparting particles are of a non-volatile inorganic oxide.
Claim 5
Dependent Claim
13 words
A method according to claim 3, in which the inorganic oxide is silica.
Claim 6
Dependent Claim
19 words
A method according to claim 1, in which sintering is carried out in the presence of graphite as friction-modifier.
Claim 7
Dependent Claim
20 words
A method according to claim 1, in which sintering is carried out in the presence of lead, tin and zinc.
Claim 8
Dependent Claim
52 words
Sintered copper friction facing suitable for operation in oil, having a void volume not less than 30% of the total volume of the facing, obtained by sintering, in the presence of silica and graphite, copper powder which is in dendritic form and of apparent density not greater than 1.3 gram/cm 3 .
Claim 9
Dependent Claim
52 words
Sintered copper friction facing suitable for operation in oil, having a void volume not less than 30% of the total volume of the facing, obtained by sintering, in the presence of silica and graphite, copper powder which is in dendritic form and of apparent density not greater than 1.3 gram/cm 3 .
References Cited (Backward Citations)
US1714564A
Cited
US2251410A
Cited
US2273589A
Cited
US3078552A
Cited
GB1201772A
Cited
GB2135411A
Cited
GB2148424A
Cited
EP0166435A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |