US3576769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semicarbonization of thermally stable aromatic polymers
Assignee: Monsanto Co
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Filing: 1967-05-02
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Granted: 1971-04-27
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Expires: 1987-05-02
Abstract
Abstract THERMALLY STABLE AROMATIC POLYAMIDES IN FIBER OR FABRIC FORM ARE SUBJECTED TO A CONTROLLED HEAT TREATMENT IN AIR UNDER MODERATE CONDITIONS, CAUSING SEMI- OR PARTIAL CARBONIZATION TO OCCUR, AND THE RESULTING FIBERS OR FABRICS ARE ESSENTIALLY NON-FLAMMABLE, THERMALLY STABLE, CHEMICALLY INERT AND EXHIBIT GOOD DIMENSIONAL STABILITY AT ELEVATED TEMPERATURES. FIBROUS PRODUCTS OBTAINED BY THIS PROCESS ARE USEFUL IN TEMPERATURE RESISTANT COMPOSITE STRUCTURES AND AS PROTECTIVE COVERING FOR ARTICLES THAT MAY BE EXPOSED TO FLAMES.
Inventors
- 👤 Stephen S Hirsch
- 👤 John R Holsten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:09
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/24; D01F9/28; D01F9/30; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |