Patent US4111891A successfully refreshed from Google Patents.
US4111891A
Expired / Lapsed
US
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Friction material for railroad disc brakes
Assignee: Johns Manville Corp
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Filing: 1976-11-12
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Granted: 1978-09-05
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Expires: 1996-11-12
Abstract
Abstract A railroad disc brake shoe composition is disclosed comprising, in parts by weight: Phenolic resin binder: 25-35 parts Carbonaceous component: 2-12 parts Asbestos fiber: 35-50 parts Silicon carbide: 0.4-3 parts
Inventors
- 👤 Harold John Reynolds, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:09
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/02; C08K3/04; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C08K7/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
35 words
A friction material useful as a brake shoe for railroad disc brakes which comprises, in parts by weight: phenolic resin binder: 25-35 parts carbonaceous component: 2-12 parts asbestos fiber: 35-50 parts silicon carbide: 0.4-3 parts
Claim 2
Dependent Claim
35 words
A friction material useful as a brake shoe for railroad disc brakes which comprises, in parts by weight: phenolic resin binder: 25-35 parts carbonaceous component: 2-12 parts asbestos fiber: 35-50 parts silicon carbide: 0.4-3 parts
Claim 3
Dependent Claim
21 words
A friction material as in claim 1 further comprising, in parts by weight: ground cashew nut shell resin particles: 2-10 parts
Claim 4
Dependent Claim
17 words
A friction material as in claim 2 further comprising, in parts by weight: nitrile rubber: 0.5-12 parts
Claim 5
Dependent Claim
17 words
A friction material as in claim 3 further comprising, in parts by weight: inert filler: 1-25 parts
Claim 6
Dependent Claim
18 words
A friction material as in claim 4 wherein said filler comprises a mixture of organic and inorganic components.
Claim 7
Dependent Claim
29 words
A friction material as in claim 5 wherein said filler comprises a mixture of 0.5-10 parts by weight of ground tire peel and 0.5-15 parts by weight of barytes.
Claim 8
Dependent Claim
15 words
A friction material as in claim 1 wherein said carbonaeous component comprises a graphitic carbon.
Claim 9
Dependent Claim
14 words
A friction material as in claim 1 wherein said carbonaceous component comprises carbon black.
Claim 10
Dependent Claim
18 words
A friction material as in claim 2 wherein said ground cashew nut shell resin particles are fully cured.
Claim 11
Dependent Claim
18 words
A friction material as in claim 1 wherein said carbonaeous component is present as 4-8 parts by weight.
Claim 12
Dependent Claim
35 words
A friction material useful as a brake shoe for railroad disc brakes comprising, in approximate parts by weight: phenolic resin binder: 29 parts silicon carbide: 0.6 parts asbestos fiber: 41 parts graphitic carbon: 6 parts
Claim 13
Dependent Claim
35 words
A friction material useful as a brake shoe for railroad disc brakes comprising, in approximate parts by weight: phenolic resin binder: 29 parts silicon carbide: 0.6 parts asbestos fiber: 41 parts graphitic carbon: 6 parts
Claim 14
Dependent Claim
24 words
A friction material as in claim 11 further comprising, in approximate parts by weight: fully cured ground cashew nut shell resin particles: 6 parts
Claim 15
Dependent Claim
18 words
A friction material as in claim 12 further comprising, in approximate parts by weight: nitrile rubber: 6 parts
Claim 16
Dependent Claim
22 words
A friction material as in claim 13 further comprising, in approximate parts by weight: ground tire peel: 6 parts barytes: 6 parts
Claim 17
Dependent Claim
13 words
A railroad disc brake shoe composed of the friction material of claim 1.
Claim 18
Dependent Claim
13 words
A railroad disc brake shoe composed of the friction material of claim 11.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |