US4000982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing material
Assignee: Taiho Kogyo Co Ltd
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Filing: 1975-04-10
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Granted: 1977-01-04
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Expires: 1995-04-10
Abstract
Abstract A bearing material which comprises a back metal; a porous sintered layer formed by using a powder of iron, copper, iron alloy or copper alloy on said back metal; and an impregnated layer formed by impregnating a mixture of polytetrafluoroethylene resin powder, zinc powder and aluminum oxide powder to said porous sintered layer, said bearing material having excellent resistance to load, wear and scraping and being suitable for reciprocating sliding mechanisms receiving large and fluctuating loads.
Inventors
- 👤 Hiroshi Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:43
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C33/121; B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; B22F7/00; B22F7/02; B22F7/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12063; Y10T428/1209; Y10T428/12104; Y10T428/12111; Y10T428/12139; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/1266; Y10T428/12667
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
In a bearing material comprising a metal back, a porous sintered metal matrix layer bonded to a surface of said metal back, said metal layer consisting essentially of particles of a metal selected from the group consisting of iron, iron alloys, copper and copper alloys; and a composition impregnated into and substantially filling the voids in said metal layer and forming a surface layer thereon, the improvement which comprises: said composition consists essentially of a uniform blend of 45 to 94 percent by weight of polytetrafluoroethylene, 5 to 50 percent by weight of zinc metal powder and 1 to 5 percent by weight of aluminum oxide powder.
Claim 2
Dependent Claim
107 words
In a bearing material comprising a metal back, a porous sintered metal matrix layer bonded to a surface of said metal back, said metal layer consisting essentially of particles of a metal selected from the group consisting of iron, iron alloys, copper and copper alloys; and a composition impregnated into and substantially filling the voids in said metal layer and forming a surface layer thereon, the improvement which comprises: said composition consists essentially of a uniform blend of 45 to 94 percent by weight of polytetrafluoroethylene, 5 to 50 percent by weight of zinc metal powder and 1 to 5 percent by weight of aluminum oxide powder.
Claim 3
Dependent Claim
36 words
A bearing material as claimed in claim 1, in which said porous sintered metal layer is made of a material selected from the group consisting of copper-tin alloy powder, copper-lead alloy powder and copper-lead-tin alloy powder.
Claim 4
Dependent Claim
28 words
A bearing material as claimed in claim 1, in which said porous sintered metal layer is made of a mixture of iron powder, copper powder and tin powder.
Claim 5
Dependent Claim
34 words
A bearing material as claimed in claim 1, in which said composition is applied to said porous sintered metal layer by impregnation, and then is baked at a temperature of 380° to 400° C.
Claim 6
Dependent Claim
24 words
A bearing material as claimed in claim 1 in which said composition contains from 10 to 35 percent by weight of zinc metal powder.
Claim 7
Dependent Claim
41 words
A bearing material as claimed in claim 1 in which said composition consists essentially of about 82 percent by weight of polytetrafluoroethylene, about 3 percent by weight of aluminum oxide powder and about 15 percent by weight of zinc metal powder.
References Cited (Backward Citations)
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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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |