Patent US441401A successfully refreshed from Google Patents.
US3660197A
Expired / Lapsed
US
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Method of making a warp sheet comprising carbon filaments
Assignee: Akzo Nobel UK PLC
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Filing: 1969-02-28
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Granted: 1972-05-02
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Expires: 1989-02-28
Abstract
Abstract A process for the production of a warp sheet which comprises preparing a sheet of an inert material and coating that sheet with a polymeric material which can be rendered tacky, causing a number of oriented carbon filaments to adhere to the tacky coating, covering the exposed surface of the carbon filaments with polymeric material, and treating the polymeric material to reduce the degree of tack. Thin warp sheets may be prepared by applying a relatively thick layer of carbon filaments and removing those which do not adhere while thicker sheets are made by spreading the requisite quantity of carbon filaments uniformly over the surface.
Inventors
- 👤 Peter E Morgan
- 👤 Ronald William Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:44
CPC Classifications
B; B32; B32B; B32B27/00; B29; B29C; B29C70/00; B29C70/04; B29K; B29K2307/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T156/1095; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249945; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
The process as claimed in claim 1 in which the sheet is made from a material selected from polyester and cellulosic material.
Claim 2
Dependent Claim
18 words
The process as claimed in claim 1 in which the resinous coating material is an epoxy novolak resin.
Claim 3
Dependent Claim
25 words
The process as claimed in claim 1 in which the resinous coating material is diluted with a solvent before being applied to the backing sheet.
Claim 4
Dependent Claim
36 words
The process as claimed in claim 1 in which a layer of carbon filaments is applied to the tacky coating with the filaments lying in a substantially unidirectional manner and any unadherent filaments are subsequently removed.
Claim 5
Dependent Claim
41 words
The process as claimed in claim 1 in which the exposed surfaces of the adherent carbon filaments are covered with resinous material by the application to the assembly of filaments of a solvent for the resinous material providing the tacky coating.
Claim 6
Dependent Claim
23 words
The process as claimed in claim 1, in which the solvent for the resinous material is applied in the form of a mist.
Claim 7
Dependent Claim
32 words
The process as claimed in claim 1 in which the exposed surfaces of adherent carbon filaments are covered with resinous material by the application thereto of a solution of the polymeric material.
Claim 8
Dependent Claim
40 words
The process as claimed in claim 1 in which the resinous material is an epoxy novolak resin and is partially cured after formation of the warp sheet by heating it at about 80* C for not more than 20 minutes.
References Cited (Backward Citations)
US2758630A
Cited
US3156027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |