US4352750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction material for railroad brake shoes
Assignee: Johns Manville
•
Filing: 1981-08-03
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Granted: 1982-10-05
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Expires: 2001-08-03
Abstract
Abstract A railroad brake shoe composition free of fiber reinforcement comprising, in percent by weight: Phenolic Resin Binder: 1-15% Carbonaceous Component: 30-60% Organic Component: 15-30% Inorganic Component: 5-35% Friction Modifiers: 1-15% Additives: 1-7%.
Inventors
- 👤 Frank W. Eschen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:55
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A friction material fiber free composition suitable for use as a brake shoe for railroad service comprising by volume: Phenolic Resin Binder: 1-15% Carbonaceous Component: 30-60% Organic Component: 15-30% Inorganic Component: 5-35% Friction Modifiers: 1-15% With the balance of other additives being: 1-7%.
Claim 2
Dependent Claim
43 words
A friction material fiber free composition suitable for use as a brake shoe for railroad service comprising by volume: Phenolic Resin Binder: 1-15% Carbonaceous Component: 30-60% Organic Component: 15-30% Inorganic Component: 5-35% Friction Modifiers: 1-15% With the balance of other additives being: 1-7%.
Claim 3
Dependent Claim
22 words
The friction material composition of claim 1 wherein the phenolic resin component comprises between 5% to 10% by volume of the composition.
Claim 4
Dependent Claim
19 words
The friction material composition of claim 2 wherein the carbonaceous component comprises between 30%-50% by volume of the composition.
Claim 5
Dependent Claim
20 words
The friction material composition of claim 3 wherein the inorganic component comprises 15% to 25% by volume of the composition.
Claim 6
Dependent Claim
22 words
The friction material composition of claim 4 wherein the friction modifier component comprises between 5% to 10% by volume of the composition.
Claim 7
Dependent Claim
21 words
The friction material composition of claim 5 wherein the organic component comprises between 20% to 25% by volume of the composition.
Claim 8
Dependent Claim
84 words
A friction material composition suitable for use as a molded brake shoe for railroad service consisting essentially of: Crumb Rubber with 10% talc: 23.36%; Rubbermakers' Sulfur: 0.45%; TMTD Rubber Accelerator: 0.33%; MBT Rubber Accelerator: 0.31%; Antioxidant: 0.22%; Stearic Acid: 0.28%; Zinc Oxide: 0.21%; Carbon Black Powder: 9.33%; Carbon Flour: 9.33%; Iron Chromite: 5.81%; Red Iron Oxide: 3.83%; Silicon Carbide Microgrit: 0.36%; Carbon Base Filler: 9.21%; Rubbermakers' Hard Clay: 13.39%; Hard Rubber Dust: 8.58%; Mineral Rubber: 5.61%; Liquid Cashew Nut Resin: 8.48%; and Hemamethylenetetramine: 0.91%.
Claim 9
Dependent Claim
84 words
A friction material composition suitable for use as a molded brake shoe for railroad service consisting essentially of: Crumb Rubber with 10% talc: 23.36%; Rubbermakers' Sulfur: 0.45%; TMTD Rubber Accelerator: 0.33%; MBT Rubber Accelerator: 0.31%; Antioxidant: 0.22%; Stearic Acid: 0.28%; Zinc Oxide: 0.21%; Carbon Black Powder: 9.33%; Carbon Flour: 9.33%; Iron Chromite: 5.81%; Red Iron Oxide: 3.83%; Silicon Carbide Microgrit: 0.36%; Carbon Base Filler: 9.21%; Rubbermakers' Hard Clay: 13.39%; Hard Rubber Dust: 8.58%; Mineral Rubber: 5.61%; Liquid Cashew Nut Resin: 8.48%; and Hemamethylenetetramine: 0.91%.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |