US3576774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of polyesters with cyclic tris (ethylene terephthalate)
Assignee: Goodyear Tire and Rubber Co
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Filing: 1969-10-27
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Granted: 1971-04-27
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Expires: 1989-10-27
Abstract
Abstract POLYETHYLENE TERPHTHALATE IS INCREASED IN MOLECULAR WEIGHT BY TREATING THE SAME AFTER POLYCONDENSATION WITH 1 TO 50 WEIGHT PERCENT OF CYCLIC TRIS(ETHYLENE TEREPHTHALATE).
Inventors
- 👤 Richard E Myers
- 👤 Jack D Hauenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:53
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78
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) | 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 |