Patent US2400887A successfully refreshed from Google Patents.
US2898631A
Expired / Lapsed
US
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Method of forming articles from silicone elastomers and polytetra fluoroethylene
Assignee: Rolls Royce PLC
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Filing: 1956-12-18
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Granted: 1959-08-11
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Expires: 1976-12-18
Abstract
No abstract record available.
Inventors
- 👤 Jeffery Norman Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
B; B32; B32B; B32B27/00; Y; Y10; Y10S; Y10S264/00; Y10S264/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD OF FORMING AN ARTICLE FROM A SILICONE ELASTOMER WITH WHICH IS INCORPORATED POLYTETRAFLUOROETHYLENE WHICH COMPRISES LAMINATING THIN LAYERS CONSISTING SUBSTANTIALLY ENTIRELY OF A SILCONE ELASTOMER WITH ALTERNATE LAYERS CONSISTING SUBSTANTIALLY ENTIRELY OF POLYTETRAFLUOROETHYLENE INTO A THICK SHEET, EXTRUDING SAID SHEET THROUGH A HOLE OF SMALL DIAMETER IN SUCH A MANNER THAT A SOLID THREAD IS PRODUCED COMPRISING ROUGHLY CONCENTRIC SHEATHS ALTERNATELY HAVING THE COMPOSITIONS OF SAID LAYERS, FORMING AT LEAST A FOUR TURN COIL OF SAID THREAD AND MOULDING THE ARTICLE FROM THE COIL SO PRODUCED.
Claim 2
Independent Claim
88 words
THE METHOD OF FORMING AN ARTICLE FROM A SILICONE ELASTOMER WITH WHICH IS INCORPORATED POLYTETRAFLUOROETHYLENE WHICH COMPRISES LAMINATING THIN LAYERS CONSISTING SUBSTANTIALLY ENTIRELY OF A SILCONE ELASTOMER WITH ALTERNATE LAYERS CONSISTING SUBSTANTIALLY ENTIRELY OF POLYTETRAFLUOROETHYLENE INTO A THICK SHEET, EXTRUDING SAID SHEET THROUGH A HOLE OF SMALL DIAMETER IN SUCH A MANNER THAT A SOLID THREAD IS PRODUCED COMPRISING ROUGHLY CONCENTRIC SHEATHS ALTERNATELY HAVING THE COMPOSITIONS OF SAID LAYERS, FORMING AT LEAST A FOUR TURN COIL OF SAID THREAD AND MOULDING THE ARTICLE FROM THE COIL SO PRODUCED.
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) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |