Patent US3673035A successfully refreshed from Google Patents.
US3673035A
Expired / Lapsed
US
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Method of manufacturing carbon fibres
Assignee: Rolls Royce PLC
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Filing: 1969-04-15
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Granted: 1972-06-27
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Expires: 1989-04-15
Abstract
Abstract A METHOD OF MANUFACTURING CARBON FIBERS, PARTICULARLY IN THE FORM OF A SHEET OR TAPE, IN WHICH A PLURALITY OF SHEETS OR TAPES OF POLYACRYLONITRILE FIBRES ARE FED THROUGH A FURNACE OR FURNACES IN WHICH AT LEAST THE MAJORITY OF THE CONSTITUENTS OTHER THAN CARBON ARE DRIVEN OFF, THE PLURALITY COMPRISING AT LEAST 10**5 FIBRES.
Inventors
- 👤 Ian Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:09
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; D01F11/00; D01F11/10; D01F11/14; D01F9/32
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |