Patent US3351484A successfully refreshed from Google Patents.
US3351484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon fibers and method
Assignee: BP Chemicals Hitco Inc
•
Filing: 1963-11-14
•
Granted: 1967-11-07
•
Expires: 1983-11-14
Abstract
No abstract record available.
Inventors
- 👤 Carlos L Gutzeit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:26
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/124; C; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B41/00; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/5064; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A FLEXIBLE CARBON FIBER PRODUCT HAVING IMPROVED OXIDATION RESISTANCE, WHICH PRODUCT COMPRISES A SUBSTRATE OF FLEXIBLE AMORPHOUS CARBON FIBER IN A FULLY FIRED HEAT SHRUNK CONDITION, AND A THIN FLEXIBLE SURFACE COATING OF BORON NITRIDE EXTENDING OVER ESSENTIALLY ALL OF THE SURFACE AREA OF THE SUBSTRATE AND MOLECULARLY BONDED TO THE SURFACE OF THE SUBSTRATE, WHEREBY THE PRODUCT IS UNITARY IN STRUCTURE, THE BORON NITRIDE COATING BEING PRESENT IN A CONCENTRATION OF BETWEEN ABOUT 1 AND ABOUT 4 PERCENT, BY WEIGHT OF THE PRODUCT AND HAVING BEEN FORMED IN SITU ON THE SURFACE OF SAID CARBON FIBERS AT AN ELEVATED TEMPERATURE BELOW THAT AT WHICH SUBSTANTIAL GRAPHITIZATION OF CARBON FIBER OCCURS AND IN A NON-OXIDIZING ATMOSPHERE.
Claim 2
Dependent Claim
116 words
A FLEXIBLE CARBON FIBER PRODUCT HAVING IMPROVED OXIDATION RESISTANCE, WHICH PRODUCT COMPRISES A SUBSTRATE OF FLEXIBLE AMORPHOUS CARBON FIBER IN A FULLY FIRED HEAT SHRUNK CONDITION, AND A THIN FLEXIBLE SURFACE COATING OF BORON NITRIDE EXTENDING OVER ESSENTIALLY ALL OF THE SURFACE AREA OF THE SUBSTRATE AND MOLECULARLY BONDED TO THE SURFACE OF THE SUBSTRATE, WHEREBY THE PRODUCT IS UNITARY IN STRUCTURE, THE BORON NITRIDE COATING BEING PRESENT IN A CONCENTRATION OF BETWEEN ABOUT 1 AND ABOUT 4 PERCENT, BY WEIGHT OF THE PRODUCT AND HAVING BEEN FORMED IN SITU ON THE SURFACE OF SAID CARBON FIBERS AT AN ELEVATED TEMPERATURE BELOW THAT AT WHICH SUBSTANTIAL GRAPHITIZATION OF CARBON FIBER OCCURS AND IN A NON-OXIDIZING ATMOSPHERE.
References Cited (Backward Citations)
CA699790A
Cited
US455187A
Cited
US1738976A
Cited
US2839426A
Cited
US2865715A
Cited
GB874165A
Cited
FR1190308A
Cited
FR1222837A
Cited
US2992960A
Cited
US3071637A
Cited
US3189477A
Cited
US3108018A
Cited
US3131089A
Cited
US3152006A
Cited
GB951280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |