US3738463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake or clutch lining
Assignee: INST fur HARTEREI TEEHNIK DT
•
Filing: 1971-03-11
•
Granted: 1973-06-12
•
Expires: 1991-03-11
Abstract
Abstract The present invention relates to brakes or clutches having the frictional surfaces thereof boronized on one or both of the braking or clutching surfaces.
Inventors
- 👤 H Kunst
- 👤 H Wasels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:01
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/027; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
Brake or clutch containing two friction faces comprising a ferrous metal base, which can be pressed against each other, at least one of said friction faces being coated with a boron layer applied by diffusion boronizing, the boron being formed on the supporting metal surface in the form of teeth anchored therein and which protrude from the surface of said supporting metal to different heights.
Claim 2
Dependent Claim
65 words
Brake or clutch containing two friction faces comprising a ferrous metal base, which can be pressed against each other, at least one of said friction faces being coated with a boron layer applied by diffusion boronizing, the boron being formed on the supporting metal surface in the form of teeth anchored therein and which protrude from the surface of said supporting metal to different heights.
Claim 3
Dependent Claim
38 words
Brake or clutch according to claiM 1 wherein said boron layer is applied to a supporting metal selected from the group consisting of malleable cast iron, gray iron, spheroidal-graphite iron castings, steels, low alloyed steels and sintered steels.
Claim 4
Dependent Claim
47 words
Brake or clutch according to claim 1 wherein said boron layer is in the form of boride crystals produced vertical to the frictional surface, and said crystals being anchored into the supporting material by tooth-like ends whereby said boride crystals are effectively bonded to said frictional surface.
Claim 5
Dependent Claim
39 words
Brake or clutch according to claim 1 wherein said boron layer is in the form of boride crystals produced vertical to the frictional surface and are in staggered heights with size differences of the order of about 2 microns.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |