Patent US3552922A successfully refreshed from Google Patents.
US3552922A
Expired / Lapsed
US
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Method for the manufacture of carbon fiber
Assignee: Nippon Carbon Co Ltd
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Filing: 1967-07-14
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Granted: 1971-01-05
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Expires: 1987-07-14
Abstract
Abstract A CONTINUOUS LENGTH OF FILAMENT IS SPUN FROM A MOLTEN PYROLYTIC LIQUID OBTAINED BY TREATING PETROLEUM ACID SLUDGE. THE FILAMENT THUS PRODUCED IS TREATED IN A RESINOUS SOLUTION IN ORDER TO MODIFY THE SURFACE THEREOF AND PRODUCE AN INFUSIBLE ONE, WHICH IS SUBJECTED TO A CARBONIZING TREATMENT TO MAKE A CARBON FIBER, AND FURTHER TO A GRAPHITIZING TREATMENT TO MAKE A GRAPHITE FIBER.
Inventors
- 👤 Toshikatsu Ishikawa
- 👤 Masutaka Morishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:04
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/155; D01F9/32; D01F9/322; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |