US3914504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sized carbon fibers
Assignee: Hercules LLC
•
Filing: 1973-10-01
•
Granted: 1975-10-21
•
Expires: 1993-10-01
Abstract
Abstract Carbon fibers are coated with a sizing composition comprising a polyglycidyl ether, cycloaliphatic polyepoxide or their mixtures. Preferred sizes are mixtures of a liquid diglycidyl ether of bisphenol A and a solid diglycidyl ether of bisphenol A.
Inventors
- 👤 Winfred E Weldy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:14
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/14; C; C08; C08L; C08L63/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A CARBON FIBBER HAVING COATED ON THE SURFACE THEREOF FROM ABOUT 0.4 TO ABOUT 5.0% BY WEIGHT, BASED ON THE WEIGHT OF THE FIBER OF A SIZING COMPOSITION SELECTED FROM THE GROUP CONSISTING OF POLYGLCIDY ETHERS, CYCLOALIPHATIC POLYOXIDES AND MIXTURES THEREOF.
Claim 2
Dependent Claim
41 words
A CARBON FIBBER HAVING COATED ON THE SURFACE THEREOF FROM ABOUT 0.4 TO ABOUT 5.0% BY WEIGHT, BASED ON THE WEIGHT OF THE FIBER OF A SIZING COMPOSITION SELECTED FROM THE GROUP CONSISTING OF POLYGLCIDY ETHERS, CYCLOALIPHATIC POLYOXIDES AND MIXTURES THEREOF.
Claim 3
Dependent Claim
66 words
A carbon fiber as set forth in claim 1 wherein the sizing composition is selected from the group consisting of: a. a liquid diglycidyl ether of bisphenol A; b. 2,6-diglycidyl phenyl glycidyl ether; c. a mixture of a solid diglycidyl ether of bisphenol A and a liquid diglycidyl ether of bisphenol A; and d. a mixture of bis-2,3-epoxycyclopentyl ether and the diglycidyl ether of bisphenol A.
Claim 4
Dependent Claim
68 words
A carbon fiber as set forth in claim 1 wherein the sizing composition comprises a mixture of about 50 to about 80% by weight of a solid diglycidyl ether of bisphenol A having a molecular weight of about 380 to about 1400 and about 20 to about 50% by weight of a liquid diglycidyl ether of bisphenol A having a molecular weight of about 340 to about 380.
Claim 5
Dependent Claim
68 words
A carbon fiber as set forth in claim 1 wherein the sizing composition comprises a mixture of about 20 to about 50% by weight of a solid diglycidyl ether of bisphenol A having a molecular weight of about 380 to about 1400 and about 50 to about 80% by weight of a liquid diglycidyl ether of bisphenol A having a molecular weight of about 340 to about 380.
References Cited (Backward Citations)
US2735829A
Cited
US2881090A
Cited
US3100756A
Cited
US3512919A
Cited
US3441522A
Cited
US3298859A
Cited
US3837904A
Cited
US3660140A
Cited
US3839072A
Cited
US3844822A
Cited
US3806489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |