Patent US3767741A successfully refreshed from Google Patents.
US3767741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making carbon fibers from solvent extracted and airblown vacuum distillation residues of petroleum
Assignee: Eneos Corp
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Filing: 1970-12-10
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Granted: 1973-10-23
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Expires: 1990-12-10
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF A CARBON FIBER, WHICH COMPRISES REMOVING THE LOW MOLECULAR WEIGHT SATURATES FRACTION FROM THE VACUUM DISTILATION RESIDUE OF PETROLEUM BY SOLVENT EXTRACTION AND SUBJECTING THE PRODUCT OBTAINED TO AN AIRBLOWING TREATMENT TO OBTAIN A BITUMINOUS MATERIAL HAVING A PENETRATION OF FROM 0 TO 2 AND A SOFTENING POINT OF FROM 130 TO 200*C. AND THEN MELT-SPINNING THE BITUMINOUS MATERIAL AND CARBONIZING IT, IT DISCLOSED.
Inventors
- 👤 M Toyoguchi
- 👤 H Iijima
- 👤 K Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:02
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S273/00; Y10S273/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |