US3629202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating polyesters with organic acids for improved stability
Assignee: Eastman Kodak Co
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Filing: 1969-09-12
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Granted: 1971-12-21
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Expires: 1989-09-12
Abstract
Abstract POLYESTERS OF IMPROVED THERMAL AND HYDROLYTIC STABILITY OBTAINED BY TREATING THE POLYMERS CONTAINING RESIDUES OF METAL CONDENSATION CATALYSTS EMPLOYED IN THEIR PREPARATION WITH AN ACIDIC ORGANIC COMPOUND HAVING AN IONIZATION CONSTANT OF ABOUT 2X10**-1 TO 2.5X10**-6 TO REMOVE THE RESIDUES.
Inventors
- 👤 Russell Gilkey
- 👤 Thomas Hamilton Wicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/88; C08G63/90
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |