Patent US3654192A successfully refreshed from Google Patents.
US3654192A
Expired / Lapsed
US
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Poly(arylene s-triazines)
Assignee: 3M Co
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Filing: 1968-08-19
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Granted: 1972-04-04
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Expires: 1988-08-19
Abstract
Abstract AROMATIC DINITRILES, SUCH AS 4,4''-DICYANODIPHENYL ETHER, ARE HEATED IN THE PRESENCE OF A CATALYST, SUCH AS TRIFLUOROMETHANE SULFONIC ACID OR A LEWIS ACID CATALYST, E.G., ZINC CHLORIDE, TO FORM SOLID POLYMERS WITH A PLURALITY OF S-TRIAZINE RINGS LINKED TOGETHER WITH ARYLENE BRIDGES, SUCH POLYMERS BEING USEFUL IN FILMS, COATINGS, FIBERS, MOLDED ARTICLES, ADHESIVES, AND SEALANTS.
Inventors
- 👤 Herward A Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:46
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/0644; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 0
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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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |