US2987503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters light-stabilized with 4-thiazolidone derivatives
Assignee: Eastman Kodak Co
•
Filing: 1957-01-04
•
Granted: 1961-06-06
•
Expires: 1977-01-04
Abstract
No abstract record available.
Inventors
- 👤 James A Van Allan
- 👤 Gerald R Lappin
- 👤 John W Tamblyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08K; C08K5/00; C08K5/36; C08K5/45; C08K5/46; C08K5/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR STABILIZING A POLYESTER FROM A DIHYDRIC ALCOHOL AND A DICARBOXYLIC ACID COMPRISING ADDING 1-6% BASED ON THE WEIGHT IN COMBINED FORM OF THE FINAL POLYMERIC MATERIAL OF A 4-THIAZOLIDONE HAVING THE FORMULA:
Claim 2
Dependent Claim
35 words
A PROCESS FOR STABILIZING A POLYESTER FROM A DIHYDRIC ALCOHOL AND A DICARBOXYLIC ACID COMPRISING ADDING 1-6% BASED ON THE WEIGHT IN COMBINED FORM OF THE FINAL POLYMERIC MATERIAL OF A 4-THIAZOLIDONE HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |