US3556712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making flame-proof fibers
Assignee: Nippon Carbon Co Ltd
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Filing: 1968-05-23
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Granted: 1971-01-19
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Expires: 1988-05-23
Abstract
Abstract IN A PROCESS FOR THE MANUFACTURE OF A HIGH TENCITY HIGH FLAME-PROOF CARBONIZED FIBER FROM A CELLULOSIC VISCOSE RAYON, A MODIFIED VISCOSE RAYON FIBER HAVING A HIGH DEGREE OF POLYMERIZATION IS USED AS A STARTING CELLULOSIC MATERIAL.
Inventors
- 👤 Kazumasa Yoneshige
- 👤 Haruo Teranishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:51
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16; 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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |