US3876444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating high strength carbon fibers
Assignee: General Electric Co
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Filing: 1972-10-11
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Granted: 1975-04-08
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Expires: 1992-10-11
Abstract
Abstract A method of treating high strength carbon fibers comprises treating such fibers with an aqueous solution of the formate, acetate and nitrate salts of copper, lead, cobalt and cadmium, and vanadium pentoxide, and subsequently mildly oxidizing the fibers in air or oxygen at a temperature in the range of from 200.degree. to 600.degree.C. This method uniformly roughens the fiber surfaces thereby providing a desirable fiber structure for employment in a carbon-polymer composite.
Inventors
- 👤 Douglas W Mckee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:30
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/14; C; C08; C08K; C08K9/00; D01F11/12; D01F11/122; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
A METHOD FOR TREATING HIGH STRENGHT CARBON FIBER HAVING A TENSILE STRENGTH OF AT LEAST 200,000 PSI AND A MODULUS OF AT LEAST 20 X 10**6 PSI TO IMPROVE THE BONDING CHARACTERISTICS OF THE FIBER TO RESIN MATRIX WHICH COMPRISES:
Claim 2
Independent Claim
40 words
A METHOD FOR TREATING HIGH STRENGHT CARBON FIBER HAVING A TENSILE STRENGTH OF AT LEAST 200,000 PSI AND A MODULUS OF AT LEAST 20 X 10**6 PSI TO IMPROVE THE BONDING CHARACTERISTICS OF THE FIBER TO RESIN MATRIX WHICH COMPRISES:
Claim 3
Dependent Claim
36 words
COATING THE FIBER WITH ABOUT 0.01 TO ABOUT 10 PERCENT BY WEIGHT OF THE FORMATE, ACETATE AND NITRATE SALTS OF A METAL SELECTED FROM THE CLASS CONSISTING OF COPPER, LEAD, COBALT AND CADMIUM, AND VANADIUM PENTOXIDE
Claim 4
Dependent Claim
36 words
COATING THE FIBER WITH ABOUT 0.01 TO ABOUT 10 PERCENT BY WEIGHT OF THE FORMATE, ACETATE AND NITRATE SALTS OF A METAL SELECTED FROM THE CLASS CONSISTING OF COPPER, LEAD, COBALT AND CADMIUM, AND VANADIUM PENTOXIDE
Claim 5
Dependent Claim
20 words
HEATING THE FIBER AT A TEMPERATURE IN THE RANGE OF FROM 200* TO 600*C IN AN OXYGEN CONTAINING ATMOSPHERE, AND
Claim 6
Dependent Claim
20 words
HEATING THE FIBER AT A TEMPERATURE IN THE RANGE OF FROM 200* TO 600*C IN AN OXYGEN CONTAINING ATMOSPHERE, AND
Claim 7
Dependent Claim
24 words
A method as in claim 1 wherein the salt is cupric acetate, the oxygen containing atmosphere is air, the heating temperature is about 500.degree.C.
Claim 8
Dependent Claim
24 words
A method as in claim 1, wherein the salt is lead acetate, the oxygen containing atmosphere is air, the heating temperature is about 400.degree.C.
Claim 9
Dependent Claim
21 words
TREATING THE SURFACE OF THE FIBER WITH AN AQUEOUS ACID SOLUTION TO EFFECT THE REMOVAL OF THE COATING OF METAL SALT.
Claim 10
Dependent Claim
21 words
TREATING THE SURFACE OF THE FIBER WITH AN AQUEOUS ACID SOLUTION TO EFFECT THE REMOVAL OF THE COATING OF METAL SALT.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |