Patent US3337301A successfully refreshed from Google Patents.
US3337301A
Expired / Lapsed
US
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Process for carbonizing fibrous cellulosic materials
Assignee: HAVEY IND Inc
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Filing: 1964-01-17
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Granted: 1967-08-22
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Expires: 1984-01-17
Abstract
No abstract record available.
Inventors
- 👤 Purnal L Mcwhorter
- 👤 Ernest O Ohsol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:20
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN A PROCESS OF PREPARING CARBON FIBERS FROM CELLULOSIC FIBERS THE IMPROVEMENT COMPRISING CARRYING OUT THE PYROLSIS OF PARTIALLY CARBONIZED CELLULOSIC FIBERS AT A TEMPERATURE OF ABOVE 700*F. IN THE PRESENCE OF STEAM WHICH HAS CARBON MONOXIDE AND HYDROGEN THEREIN AS A RESULT OF HAVING BEEN PASSED OVER REACTIVE CARBON AT A TEMPERATURE AT LEAST EQUAL TO THE PYROLYSIS TEMPERATURE PRIOR TO TREATMENT OF THE PARTIALLY CARBONIZED FIBERS THEREWITH.
Claim 2
Dependent Claim
69 words
IN A PROCESS OF PREPARING CARBON FIBERS FROM CELLULOSIC FIBERS THE IMPROVEMENT COMPRISING CARRYING OUT THE PYROLSIS OF PARTIALLY CARBONIZED CELLULOSIC FIBERS AT A TEMPERATURE OF ABOVE 700*F. IN THE PRESENCE OF STEAM WHICH HAS CARBON MONOXIDE AND HYDROGEN THEREIN AS A RESULT OF HAVING BEEN PASSED OVER REACTIVE CARBON AT A TEMPERATURE AT LEAST EQUAL TO THE PYROLYSIS TEMPERATURE PRIOR TO TREATMENT OF THE PARTIALLY CARBONIZED FIBERS THEREWITH.
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |