US3553304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of solvent casting poly-1,3-benzoxazine-2,4-dione electric insulating films
Assignee: Bayer AG
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Filing: 1968-02-13
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Granted: 1971-01-05
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Expires: 1988-02-13
Abstract
Abstract THE INVENTION RELATES TO POLY-1,3-BENZOXAZINE-1,4-DIONE ELECTRIC INSULATING FILMS OBTAINED BY CASTING A SOLUTION OF A POLYMER CONSISTING ESSENTIALLY OF POLY-1,3-BENZOXAZINE2,4-DIONE IN AN INERT ORGANIC SOLVENT TO FORM A FILM, DRYING AND STRETCHING SAID FILM, THE POLY-1,3-BENZOXAZINE-2,4DIONE BEING OBTAINED BY REACTION OF A DI-O-HYDROXYARYL DICARBOXYLC ACID ARYL ESTER WITH AN ORGANIC DIISOCYANATE IN AN ORGANIC SOLVENT IN A ONE STEP REACTION.
Inventors
- 👤 Eckart Reese
- 👤 Wilhelm Rohm
- 👤 Hermann Hofmeier
- 👤 Ludwig Bottenbruch
- 👤 Hermann Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/348; C08G73/00; C08G73/06; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/302; H01B3/307
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |