US3053775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for carbonizing fibers
Assignee: Carbon Wool Corp
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Filing: 1959-11-12
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Granted: 1962-09-11
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Expires: 1979-11-12
Abstract
No abstract record available.
Inventors
- 👤 William F Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:42
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; B; B01; B01J; B01J21/00; B01J21/18; B01J27/00; B01J27/20; B01J27/22; C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/318; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S55/00; Y10S55/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR THE PRODUCTION OF A CARBON FIBER COMPRISING THE STEPS OF HEATING VISCOSE RAYON FIBER IN AN INERT ATMOSPHERE THROUGH A TEMPERATURE RANGE OF FROM ABOUT 300*F. TO ABOUT 500*F., SAID HEATING REQUIRING AT LEAST 30 MINUTES TO ATTAIN SAID 500*F. TEMPERATURE.
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE PRODUCTION OF A CARBON FIBER COMPRISING THE STEPS OF HEATING VISCOSE RAYON FIBER IN AN INERT ATMOSPHERE THROUGH A TEMPERATURE RANGE OF FROM ABOUT 300*F. TO ABOUT 500*F., SAID HEATING REQUIRING AT LEAST 30 MINUTES TO ATTAIN SAID 500*F. TEMPERATURE.
References Cited (Backward Citations)
US2925879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |