US4145223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frictional material for brakes
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1977-10-28
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Granted: 1979-03-20
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Expires: 1997-10-28
Abstract
Abstract A frictional material for brakes employs as a reinforcing material a fibrous material other than asbestos and contains non-fibrous serpentine in the amount of 5 to 80% in contents by volume. The non-fibrous serpentine has the same chemical composition as asbestos but a different crystaline structure. Since the serpentine is non-fibrous, a fibrous reinforcing material must be added. Suitable fibrous reinforcing materials are chopped glass fiber strands, cut steel wires, organic synthetic fibers and ceramic fibers.
Inventors
- 👤 Koichi Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:28
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A frictional material for brakes employing as a reinforcing material a fibrous material selected from the group consisting of glass fiber, steel wire, organic synthetic fiber and ceramic fiber and containing non-fibrous serpentine by 5 to 80% in contents by volume.
Claim 2
Dependent Claim
41 words
A frictional material for brakes employing as a reinforcing material a fibrous material selected from the group consisting of glass fiber, steel wire, organic synthetic fiber and ceramic fiber and containing non-fibrous serpentine by 5 to 80% in contents by volume.
Claim 3
Dependent Claim
20 words
A frictional material as claimed in claim 1 in which glass fiber chopped strands are employed as said reinforcing material.
Claim 4
Dependent Claim
33 words
A frictional material as claimed in claim 1 in which cut wires obtained from carbon steel having a carbon content of 0.01% to 1.0% or stainless steel are employed as said reinforcing material.
Claim 5
Dependent Claim
23 words
A frictional material as claimed in claim 1 in which a thermoplastic or thermosetting resin fiber material is employed as said reinforcing material.
Claim 6
Dependent Claim
26 words
A frictional material as claimed in claim 3 in which the cut wires are intricate and irregular in shape and are employed as said reinforcing material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |