US4548678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible sheet material and articles made therefrom
Assignee: T&N Materials Research Ltd
•
Filing: 1983-05-12
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Granted: 1985-10-22
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Expires: 2003-05-12
Abstract
Abstract Flexible sheet material suitable for use in the manufacture of wear-resistant laminated articles such as bearings and rotor blades comprises particles of graphite and heat-resistant web-forming fibres, preferably of poly (aromatic amide), bound together with an organic binder, the proportions of the ingredients being: ______________________________________ graphite 20-95% heat-resistant web-forming fibres 3-78% organic binder 2-15% ______________________________________ To make wear-resistant articles, sheets of the material are impregnated with resin, superimposed one upon another, and subjected to high pressure and elevated temperature.
Inventors
- 👤 Philip Laflin
- 👤 Ian Eddleston
- 👤 Mathew A. Hepworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:09
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/02; B29C70/021; B29C70/025; D; D21; D21H; D21H13/00; D21H13/10; D21H13/20; D21H13/26; F; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F05; F05C; F05C2253/00; F05C2253/04; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/30; Y10T442/00; Y10T442/20; Y10T442/2311; Y10T442/273; Y10T442/60; Y10T442/69; Y10T442/691
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A wear resistant lubricated bearing or rotar blade for a lubricated vane pump, said bearing or rotor blade having high compressive strength and molded from a non-asbestos flexible sheet material comprising particles of graphite admixed with heat-resistant web-forming fibres of a poly(aromatic amide), said particles and said fibres being bound together with an organic binder; said flexible sheet material being made by a process in which an aqueous slurry of the aforesaid ingredients is progressively dewatered as a layer on a water-permeable conveyor and the dewatered layer is subsequently compressed and dried, said flexible sheet material having said ingredients in the following proportions by dry weight: ______________________________________
graphite 20-40%
heat-resistant web-forming
45-78%
fibers of poly(aromatic amide)
organic binder comprising
2-15%
cellulose pulp
______________________________________
Claim 2
Dependent Claim
123 words
A wear resistant lubricated bearing or rotar blade for a lubricated vane pump, said bearing or rotor blade having high compressive strength and molded from a non-asbestos flexible sheet material comprising particles of graphite admixed with heat-resistant web-forming fibres of a poly(aromatic amide), said particles and said fibres being bound together with an organic binder; said flexible sheet material being made by a process in which an aqueous slurry of the aforesaid ingredients is progressively dewatered as a layer on a water-permeable conveyor and the dewatered layer is subsequently compressed and dried, said flexible sheet material having said ingredients in the following proportions by dry weight: ______________________________________
graphite 20-40%
heat-resistant web-forming
45-78%
fibers of poly(aromatic amide)
organic binder comprising
2-15%
cellulose pulp
______________________________________
Claim 3
Dependent Claim
24 words
Flexible sheet material according to claim 1, in which the binder is a mixture of cellulose pulp and an elastomer deposited from a latex.
Claim 4
Dependent Claim
14 words
Flexible sheet material according to claim 2, in which the binder also contains starch.
Claim 5
Dependent Claim
38 words
Wear-resistant article of high compressive strength made by subjecting to high pressure and elevated temperature an assembly of superimposed sheets of flexible sheet material according to claim 1 which have been impregnated with a thermosetting or thermoplastic resin.
Claim 6
Dependent Claim
26 words
Wear-resistant article according to claim 4, in which the content of thermosetting or thermoplastic resin in the assembly of impregnated sheet is 30-60% by weight thereof.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |