Patent US3704255A successfully refreshed from Google Patents.
US3704255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters
Assignee: EIDP Inc
•
Filing: 1971-03-03
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Granted: 1972-11-28
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Expires: 1991-03-03
Abstract
Abstract THE POLYMERS OF THIS INVENTION ARE MADE BY FIRST REACTING AN ANHYDRIDE WITH A POLYOL, AND THEN REACTING THE PRODUCT WITH A HYDROXYL TERMINATED POLYESTER. THE POLYMERS ARE USEFUL AS FILM-FORMERS IN COATING COMPSOTIONS.
Inventors
- 👤 Robert A Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |