Patent US2808390A successfully refreshed from Google Patents.
US2808390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interpolyesters from aromatic dibasic acids and omega-hydroxyalkyl esters of carbonic acid
Assignee: Eastman Kodak Co
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Filing: 1954-07-26
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Granted: 1957-10-01
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Expires: 1974-07-26
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PROCESS FOR PREPARING A LINEAR POLYESTER COMPRISING (A) CONDENSING FROM ABOUT 1 TO ABOUT 10 MOLE PROPORTIONS OF AN AROMATIC DIBASIC ACID DIESTER HAVING THE FORMULA:
Claim 2
Dependent Claim
27 words
A PROCESS FOR PREPARING A LINEAR POLYESTER COMPRISING (A) CONDENSING FROM ABOUT 1 TO ABOUT 10 MOLE PROPORTIONS OF AN AROMATIC DIBASIC ACID DIESTER HAVING THE FORMULA:
References Cited (Backward Citations)
US2210817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |