US4280935A
Expired / Lapsed
US
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Friction material comprising an iron powder having a carbon content of from 0.5-1 percent
Assignee: Akebono Brake Industry Co Ltd
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Filing: 1979-08-31
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Granted: 1981-07-28
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Expires: 1999-08-31
Abstract
Abstract A friction material of the present invention is directed to secure a required value of an initial effect and the following effects after a friction hysteresis during a brake operation by adding 20-60 wt. % of a high carbon iron powder instead of a ceramic powder in the conventional friction material and also succeed in improving a wear resistance at a high temperature by further adding 0.5-10.5 wt. % of antimony trioxide as a flame retarding material.
Inventors
- 👤 Osao Ogiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24983; Y10T428/31
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A friction material wherein a mixture consisting of 20-60 wt.% of a high carbon iron powder having a carbon content of 0.5 to 1.0 wt.%, 0-20 wt.% of an organic friction modifier, 10-40 wt.% of a lubricant, 0-10 wt.% of a metallic powder, 5-30 wt.% of a fiber reinforcing material, 5-15 wt.% of a thermosetting resin and 0.5 to 10.5 wt.% of a flame retarding material is formed by heating under pressure.
Claim 2
Dependent Claim
72 words
A friction material wherein a mixture consisting of 20-60 wt.% of a high carbon iron powder having a carbon content of 0.5 to 1.0 wt.%, 0-20 wt.% of an organic friction modifier, 10-40 wt.% of a lubricant, 0-10 wt.% of a metallic powder, 5-30 wt.% of a fiber reinforcing material, 5-15 wt.% of a thermosetting resin and 0.5 to 10.5 wt.% of a flame retarding material is formed by heating under pressure.
Claim 3
Dependent Claim
25 words
A friction material as defined in claim 1 wherein said fiber reinforcing material consists of metal fiber, glass, aluminosilicate or silicon, or a mixture thereof.
Claim 4
Dependent Claim
62 words
A friction material as defined in claim 1 wherein said high carbon iron powder is formed in such a manner that an iron ore or a mill scale, or a mixture thereof is reduced by heating under pressure under existence of a coke and a lime and further continuously heated to carburize up to 0.5-1.0 wt.% of carbon content, and then pulverized.
Claim 5
Dependent Claim
34 words
A friction material as defined in claim 1 wherein said organic friction modifier is at least one element selected from a group consisting of a rubber particle, a cashew dust and a mixture thereof.
Claim 6
Dependent Claim
17 words
A friction material as defined in claim 1 wherein said flame retarding material is an antimony trioxide.
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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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |