Patent US4735975A successfully refreshed from Google Patents.
US4735975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction material
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1986-07-09
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Granted: 1988-04-05
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Expires: 2006-07-09
Abstract
Abstract A friction material comprising 40 to 95% by volume of a granular material and a thermoset binder resin for binding said granular material, said granular material having been produced by binding at least one powder material with a binder resin so that at least 50% by weight of the granules has a particle size between 140 mesh on and 7 mesh pass, which has good fade resistance and wear resistance.
Inventors
- 👤 Kouichi Iwata
- 👤 Hiroshi Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:14
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A friction material comprising 40 to 95% by volume of a granular material and a thermoset binder resin for binding said granular material, said granular material having been produced by binding at least one powder material with a binder resin so that at least 50% by weight of the granules has a particle size between 140 mesh on and 7 mesh pass, said granular material having a porosity of 4% or less.
Claim 2
Dependent Claim
72 words
A friction material comprising 40 to 95% by volume of a granular material and a thermoset binder resin for binding said granular material, said granular material having been produced by binding at least one powder material with a binder resin so that at least 50% by weight of the granules has a particle size between 140 mesh on and 7 mesh pass, said granular material having a porosity of 4% or less.
Claim 3
Dependent Claim
33 words
The friction material according to claim 1, wherein the granular material comprises at least one powder material selected from an inorganic powder material, an organic powder material, a powdery lubricant and metal powder.
Claim 4
Dependent Claim
24 words
The friction material according to claim 2, wherein the granular material comprises at least one inorganic powder material and at least one powdery lubricant.
Claim 5
Dependent Claim
16 words
The friction material according to claim 1, wherein the granular material further comprises a fiber material.
Claim 6
Dependent Claim
15 words
The friction material according to claim 1, which further comprises at least one powder material.
Claim 7
Dependent Claim
15 words
The friction material according to claim 5, which further comprises at least one fiber material.
Claim 8
Dependent Claim
32 words
The friction material according to claim 1, wherein the granular material has been produced by press molding a mixture containing the powder material and the binder resin and grinding the molded material.
Claim 9
Dependent Claim
32 words
The friction material according to claim 1, wherein the granular material has been produced by extrusion molding a mixture containing the powder material and the binder resin and grinding the molded material.
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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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |