US3647033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary shoe brake lining
Assignee: Bendix Corp
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Filing: 1970-05-21
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Granted: 1972-03-07
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Expires: 1990-05-21
Abstract
Abstract In a vehicle servo brake of the type having a rotatable brake drum and a primary and a secondary shoe operable to stop rotation of the drum the improvement wherein the secondary shoe has a lining wherein at least 50 percent of the total surface area of the lining is a semimetallic material and at least 15 percent is organic material.
Inventors
- 👤 Bruce W Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:19
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/04; F16D65/08; F16D51/00; F16D51/16; F16D51/18; F16D51/20; F16D69/00; F16D69/02; F16D69/025; F16D2069/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
In the combination of a brake of the type having a rotatable brake drum, a primary shoe having an organic friction material liner, and secondary shoe operable with said primary shoe to stop rotation of said drum the improvement wherein the secondary shoe comprises: a body having an anchor end and a toe end and an arcuate surface portion; a liner comprised of organic material secured to the arcuate surface portion of said body; and a semimetallic liner secured to the arcuate surface portion of said body between said organic liner and said anchor end, said semimetallic liner covering at least 50 percent, and said organic liner covering at least 15 percent of the total surface area covered by both liners on said secondary shoe.
Claim 2
Dependent Claim
39 words
The combination as recited in claim 2 wherein said organic liner on said secondary shoe covers at least 15 percent but not more than 45 percent of the total surface area covered by both liners on said secondary shoe.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |