US3716331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing carbon fibers having a high young's modulus of elasticity
Assignee: BP Corp North America Inc
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Filing: 1970-04-10
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Granted: 1973-02-13
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Expires: 1990-04-10
Abstract
Abstract Carbon fibers having a high Young''s modulus are produced by a process which comprises longitudinally stressing partially carbonized cellulosic base fibers by means of an applied tensional force while concurrently subjecting them to a carbonizing treatment. The resultant stress carbonized fibers can then be subjected to a stress graphitizing treatment, if desired.
Inventors
- 👤 W Schalamon
- 👤 R Bacon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:10
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A process for producing a high Young''s modulus of elasticity non-graphitic carbon fiber which comprises: a. heating a partially carbonized carbonaceous fiber at a temperature of from about 250*C. to about 900*C. to substantially completely carbonize said fiber , said partially carbonized carbonaceous fiber having been produced by the heat treatment of a cellulosic fiber at a temperature in the range of from about 100*C. to about 350*C. until the fiber has undergone an approximate weight loss based on the starting cellulosic material in the range of from about 20 percent to about 50 percent, while; b. concurrently stretching said fiber by means of aN applied tensional force an amount sufficient to achieve a percent effective stretch of at least 5 percent.
Claim 2
Dependent Claim
122 words
A process for producing a high Young''s modulus of elasticity non-graphitic carbon fiber which comprises: a. heating a partially carbonized carbonaceous fiber at a temperature of from about 250*C. to about 900*C. to substantially completely carbonize said fiber , said partially carbonized carbonaceous fiber having been produced by the heat treatment of a cellulosic fiber at a temperature in the range of from about 100*C. to about 350*C. until the fiber has undergone an approximate weight loss based on the starting cellulosic material in the range of from about 20 percent to about 50 percent, while; b. concurrently stretching said fiber by means of aN applied tensional force an amount sufficient to achieve a percent effective stretch of at least 5 percent.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said partially carbonized carbonaceous fiber is substantially completely carbonized in an inert atmosphere.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein said partially carbonized carbonaceous fiber is produced by heating a cellulosic fiber at a temperature in the range of from about 150 to about 350*C.
Claim 5
Dependent Claim
38 words
The process of claim 1 wherein said partially carbonized carbonaceous fiber is produced by heating a cellulosic fiber which has been treated with phosphoric acid to a temperature in the range of from about 100* to about 350*C.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein said non-graphitic carbon fiber is graphitized by heating it to a temperature in excess of 2000*C.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein said non-graphitic carbon fiber is stress graphitized by heating said fiber to a temperature of about 2800*C. while applying a stressing force thereto sufficient to permanently stretch said fiber.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |