Patent CA496077A successfully refreshed from Google Patents.
Patent US4726455A successfully refreshed from Google Patents.
US4726455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch facings
Assignee: Federal Mogul Friction Products Ltd
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Filing: 1985-12-30
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Granted: 1988-02-23
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Expires: 2005-12-30
Abstract
Abstract A moulded annular clutch facing has a plurality of surface grooves moulded into the facing. Each groove extends not substantially more than half way across the annulus, is not greater than 40% of the thickness of the facing in depth and extends either from the bore or the outer perimeter of the annulus.
Inventors
- 👤 Roy G. East
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:21
CPC Classifications
F; F16; F16D; F16D69/00; F16D13/00; F16D13/58; F16D13/60; F16D13/64; F16D2069/004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A moulded annular clutch facing having a plurality of inwardly extending surface grooves extending from the outside perimeter of the annulus and a plurality of outwardly extending surface grooves extending from the bore of the annulus, the inwardly extending grooves being directed between the outwardly extending grooves, all the grooves being not greater in depth than 40% of the thickness of the facing and all of the grooves each extending across not substantially more than half of the width of the annulus.
Claim 2
Dependent Claim
82 words
A moulded annular clutch facing having a plurality of inwardly extending surface grooves extending from the outside perimeter of the annulus and a plurality of outwardly extending surface grooves extending from the bore of the annulus, the inwardly extending grooves being directed between the outwardly extending grooves, all the grooves being not greater in depth than 40% of the thickness of the facing and all of the grooves each extending across not substantially more than half of the width of the annulus.
Claim 3
Dependent Claim
24 words
A clutch facing according to claim 1 in which the grooves have a depth not greater than 35% of the thickness of the facing.
Claim 4
Dependent Claim
23 words
A clutch facing according to claim 1 in which the width of the grooves is not greater than the thickness of the facing.
Claim 5
Dependent Claim
24 words
A clutch facing according to claim 1 or 2 in which the width of the grooves is in the range 1 to 2.5 mm.
Claim 6
Dependent Claim
22 words
A clutch facing according to claim 1 or 2 in which the width of the grooves is not greater than 1.5 mm.
Claim 7
Dependent Claim
32 words
A clutch facing according to claim 1 which is a slurry moulded facing of thickness 2 to 3 mm and the grooves have a width in the range 1 to 1.5 mm.
Claim 8
Dependent Claim
21 words
A clutch facing according to claim 1 or 6 which has an even number of grooves spaced evenly around the facing.
Claim 9
Dependent Claim
28 words
An annular clutch facing according to claim 1 or 6 in which the grooves are arranged extending alternately from the bore and the outside perimeter of the annulus.
Claim 10
Dependent Claim
21 words
A clutch facing according to claim 1, in which the inwardly extending grooves are directed midway between the outwardly extending grooves.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |