US2861964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition brake block
Assignee: Johns Manville Corp
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Filing: 1953-11-17
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Granted: 1958-11-25
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Expires: 1973-11-17
Abstract
No abstract record available.
Inventors
- 👤 Charles L E De Gaugue Jr
- 👤 Ralph T Halstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:57
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/04; F16D65/06; F16D65/062; F16D69/00; F16D69/02; F16D69/025; F16D69/026; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A MOLDED COMPOSITION BRAKE BLOCK HAVING GOOD WET AND DRY FRICTION CHARACTERISTICS AND A LONG SERVICE LIFE, COMPRISING 25-75% BY WEIGHT OF HARD FERROUS METAL AT LEAST 50% OF WHICH IS IN THE FORM OF CAST IRON PARTICLES, STAPLE ORGANIC REINFORCING FIBER IN AMOUNT FROM 2 TO 30% BY WEIGHT, AND AT LEAST 50% BY VOLUME OF NON-FERROUS INORGANIC AND ORGANIC FILLER AND ORGANIC BINDER MATERIALS INCLUDING A BINDER MATRIX COMPRISING A HEAT RESISTANT HARD VULCANIZED IN SITU RUBBER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, POLYCHLORBUTADIENE, AND BUTADIENE-STYRENE AND BUTADIENE-ACRYLONITRILE COPOLYMERS.
Claim 2
Dependent Claim
93 words
A MOLDED COMPOSITION BRAKE BLOCK HAVING GOOD WET AND DRY FRICTION CHARACTERISTICS AND A LONG SERVICE LIFE, COMPRISING 25-75% BY WEIGHT OF HARD FERROUS METAL AT LEAST 50% OF WHICH IS IN THE FORM OF CAST IRON PARTICLES, STAPLE ORGANIC REINFORCING FIBER IN AMOUNT FROM 2 TO 30% BY WEIGHT, AND AT LEAST 50% BY VOLUME OF NON-FERROUS INORGANIC AND ORGANIC FILLER AND ORGANIC BINDER MATERIALS INCLUDING A BINDER MATRIX COMPRISING A HEAT RESISTANT HARD VULCANIZED IN SITU RUBBER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, POLYCHLORBUTADIENE, AND BUTADIENE-STYRENE AND BUTADIENE-ACRYLONITRILE COPOLYMERS.
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |