Patent US4217255A successfully refreshed from Google Patents.
US4217255A
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Composition railroad friction material with synthetic fiber content
Assignee: Anchor Brake Shoe LLC
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Filing: 1979-04-16
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Granted: 1980-08-12
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Expires: 1999-04-16
Abstract
Abstract Composition railroad friction materials having low wear rates are characterized by the use of synthetic fiber and by the absence of lead and asbestos. These friction materials are particularly suitable for use in railroad brake shoes and contain, by approximate weight, 0.5-11% non-asbestos fiber, of which at least 0.5% is synthetic fiber, 66-81% filler and 14-21% organic binder.
Inventors
- 👤 Arvon M. Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:51
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
26 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 0.5-11% fiber, of which at least 0.5% is synthetic fiber, 66-81% filler and 14-21% organic binder.
Claim 2
Dependent Claim
26 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 0.5-11% fiber, of which at least 0.5% is synthetic fiber, 66-81% filler and 14-21% organic binder.
Claim 3
Dependent Claim
16 words
The friction material of claim 1, wherein the fiber content includes at least 1% glass fiber.
Claim 4
Dependent Claim
33 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 1.5-10% fiber, of which at least 0.5% is synthetic fiber and at least 0.4% is cellulose fiber, 66-80% filler and 14-21% organic binder.
Claim 5
Dependent Claim
33 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 1.5-10% fiber, of which at least 0.5% is synthetic fiber and at least 0.4% is cellulose fiber, 66-80% filler and 14-21% organic binder.
Claim 6
Dependent Claim
16 words
The friction material of claim 3, wherein the fiber content includes at least 1.5% glass fiber.
Claim 7
Dependent Claim
33 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 5-10% fiber, of which at least 2.5% is synthetic fiber and at least 2.5% is cellulose fiber, 72-79% filler and 14-19% organic binder.
Claim 8
Dependent Claim
33 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 5-10% fiber, of which at least 2.5% is synthetic fiber and at least 2.5% is cellulose fiber, 72-79% filler and 14-19% organic binder.
Claim 9
Dependent Claim
13 words
The friction material of claim 5, wherein the synthetic fiber is glass fiber.
Claim 10
Dependent Claim
33 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 2-5% fiber, of which at least 1% is synthetic fiber and at least 0.5% is cellulose fiber, 72-82% filler and 14-21% organic binder.
Claim 11
Dependent Claim
33 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 2-5% fiber, of which at least 1% is synthetic fiber and at least 0.5% is cellulose fiber, 72-82% filler and 14-21% organic binder.
Claim 12
Dependent Claim
13 words
The friction material of claim 7, wherein the synthetic fiber is glass fiber.
Claim 13
Dependent Claim
19 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 0.5-7% synthetic fiber, 72-81% filler and 15-21% organic binder.
Claim 14
Dependent Claim
19 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 0.5-7% synthetic fiber, 72-81% filler and 15-21% organic binder.
Claim 15
Dependent Claim
13 words
The friction material of claim 9, wherein the synthetic fiber is glass fiber.
Claim 16
Dependent Claim
19 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 0.5-2% synthetic fiber, 74-82% filler and 15-22% organic binder.
Claim 17
Dependent Claim
19 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 0.5-2% synthetic fiber, 74-82% filler and 15-22% organic binder.
Claim 18
Dependent Claim
13 words
The friction material of claim 11, wherein the synthetic fiber is polyester fiber.
Claim 19
Dependent Claim
19 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 1.4-3.5% synthetic fiber, 74-82% filler and 16-21% organic binder.
Claim 20
Dependent Claim
19 words
An asbestos-free and lead-free composition friction material, comprising, by weight, 1.4-3.5% synthetic fiber, 74-82% filler and 16-21% organic binder.
Claim 21
Dependent Claim
13 words
The friction material of claim 13, wherein the synthetic fiber is glass fiber.
Claim 22
Dependent Claim
19 words
The asbestos-free and lead-free composition friction material, comprising, by weight, 2.7-3.5% synthetic fiber, 74-82% filler and 16-19% organic binder.
Claim 23
Dependent Claim
19 words
The asbestos-free and lead-free composition friction material, comprising, by weight, 2.7-3.5% synthetic fiber, 74-82% filler and 16-19% organic binder.
Claim 24
Dependent Claim
13 words
The friction material of claim 15, wherein the synthetic fiber is glass fiber.
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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |