US3723610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making carbon articles
Assignee: Wacker Chemie AG
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Filing: 1971-02-19
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Granted: 1973-03-27
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Expires: 1991-02-19
Abstract
Abstract Process for making carbon filaments, foils, threads, fibers, fabrics and similar formed bodies which comprises treating such a body composed of a copolymerizate of vinyl chloride and at least one substance selected from the group consisting of polyvinyl alcohol and derivatives of polyvinyl alcohol with an acid condensation agent, such as concentrated sulfuric acid, until it becomes unmeltable at pyrolysis temperatures and then subjecting the treated body to pyrolysis. A formed body of a copolymerizate of vinyl chloride and vinyl acetate which contains 40 to 95 percent of vinyl chloride is particularly suitable in the process.
Inventors
- 👤 W Fischer
- 👤 J Heckmaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:27
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
Process according to claim 1, in which said body consists of copolymerizate of vinyl chloride and vinyl acetate which contain 40 to 95 percent of vinyl chloride.
Claim 2
Dependent Claim
21 words
Process according to claim 1, in which the treatment temperature is between 0* C and the softening temperature of said body.
Claim 3
Dependent Claim
22 words
Process according to claim 1, in which the treatment temperature is 10* - 20* C below the softening temperature of the body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |