Process for production of carbon fibers
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF SUPERIOR CARBON OR GRAPHITE FIBERS FROM POLYMETHYL VINYL KETONE, AS RAW MATERIAL, WHICH COMPRISES THE STEPS OF MELT-SPINNING FIBERS THEREFROM, STRETCH-ORIENTING THE FIBERS IN THE AXIAL DIRECTION THEREOF CYCLIZING THE COMPOUND MATERIAL CONSTITUTING THE FIBERS BY DEHYDRATION, AND CARBONIZING THE CYCLIZED FIBERS. THE CARBON FIBERS THUS OBTAINED ARE READILY CONVERTIBLE INTO GRAPHITE FIBERS BY A SIMPLE ADDITIONAL PROCESS OF GRAPHITIZATION. DESIRABLY, THE CYCLIZED POLYMETHY VINYL KETONE FIBERS ARE THEN DENATURED AS TO HAVE SUFFICIENT HEAT RESISTIVITY TO UNDERGO THE ENSUING STEP OF CARBONIZATION WITHOUT SUFFERING EIGHER DEGASIFICATION OR DEFORMATION.
Inventors
- 👤 Tadashi Araki
- 👤 Hitoshi Takita
- 👤 Kiro Asano
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |