Patent US3607672A successfully refreshed from Google Patents.
US3607672A
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Method for producing febrous carbon structures
Assignee: United States Atomic Energy Commission
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Filing: 1970-02-04
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Granted: 1971-09-21
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Expires: 1990-02-04
Abstract
Abstract Carbonized fibrous material of improved resiliency and tensile strength is produced by impregnating rayon fibers with a solution of polyethylene or polypropylene dissolved in a volatile hydrocarbon solvent such as xylene, driving off the solvent, and thereafter heating the impregnated fibers to a temperature adequate to carbonize the rayon. After carbonization, the polyethylene-treated fibers showed a marked improvement in resiliency as well as an average tensile strength increase of about 55 percent over untreated fibers of the same type.
Inventors
- 👤 Charles R Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:47
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2964; Y10T428/2965
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
The method of producing a resilient carbonaceous fiber as claimed in claim 1, wherein the solution consists essentially of about 5 to 10 weight percent of the organic polymer with the remainder being provided by the solvent.
Claim 2
Dependent Claim
55 words
The method of producing a resilient carbonaceous fiber as claimed in claim 1, wherein the fiber of regenerated cellulose is selected from the class consisting of viscose rayon, cupraammonium rayon, and saponified acetate rayon, and wherein the temperature sufficient to convert the fiber to carbon is in the range of about 900* to 1,000* C.
Claim 3
Dependent Claim
45 words
The method of producing a resilient carbonaceous fiber as claimed in claim 3, wherein the solvent is a hydrocarbon solvent selected from the group consisting of xylene, toluene, and benzene, and wherein the temperature sufficient to volatilize the solvent is less than about 100* C.
Claim 4
Dependent Claim
40 words
The method of producing a resilient carbonaceous fiber as claimed in claim 3, including the additional step of heating the carbonized fiber to a temperature in the range of about 2,500* to 3,000* C. for converting the carbon to graphite.
Claim 5
Dependent Claim
52 words
The method of producing a resilient carbonaceous fiber as claimed in claim 1, wherein the polymer is polyethylene having a melting temperature in the range of about 100* to 110* C., a molecular weight in the range of about 2,000 to 20,000, and a density of about 0.91 gram per cubic centimeter.
References 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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |