Patent US5339159A successfully refreshed from Google Patents.
US3313596A
Expired / Lapsed
US
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Carbonization of fibrous rayon
Assignee: GREAT LAKES CARBON Corp
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Filing: 1963-07-26
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Granted: 1967-04-11
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Expires: 1983-07-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Grady R Hogg
- 👤 Jr James C Reavis
- 👤 William E Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:02
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
A PROCESS OF CARBONIZING RAYON WHICH COMPRISES: HEATING THE RAYON UNDER SUBSTANTIALLY NON-OXIDIZING CONDITIONS TO A TEMPERATURE BETWEEN 325*C. AND ABOUT 390DC.; INTERRUPTING THE HEATING STEP AT A TEMPERATURE IN THIS RANGE AND FLEXING THE RAYON BY MECHANICALLY OR MANUALLY WORKING THE PRODUCT TO MAKE IT MORE SUPPLE; AND CONTINUING THE HEATING OF THE RAYON UNDER NON-OXIDIZING CONDITIONS TO A TEMPERATURE ABOVE ABOUT 500*C. TO FURTHER THE CARBONIZATION THEREOF.
Claim 2
Dependent Claim
69 words
A PROCESS OF CARBONIZING RAYON WHICH COMPRISES: HEATING THE RAYON UNDER SUBSTANTIALLY NON-OXIDIZING CONDITIONS TO A TEMPERATURE BETWEEN 325*C. AND ABOUT 390DC.; INTERRUPTING THE HEATING STEP AT A TEMPERATURE IN THIS RANGE AND FLEXING THE RAYON BY MECHANICALLY OR MANUALLY WORKING THE PRODUCT TO MAKE IT MORE SUPPLE; AND CONTINUING THE HEATING OF THE RAYON UNDER NON-OXIDIZING CONDITIONS TO A TEMPERATURE ABOVE ABOUT 500*C. TO FURTHER THE CARBONIZATION THEREOF.
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |