US2921052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of sulfonyldibenzoic acid and gem-dialkyl glycols
Assignee: Eastman Kodak Co
•
Filing: 1955-08-17
•
Granted: 1960-01-12
•
Expires: 1975-08-17
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 John W Wellman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A HIGHLY POLYMERIC LINEAR POLYESTER CAPABLE OF BEING MELT EXTRUDED INTO FIBERS AND FILM WHICH ARE USEFUL IN THEIR FORM AS EXTRUDED AND COOLED WITHOUT NECESSITY FOR STRETCHING AND HEAT TREATMENT, SAID POLYESTER BEING COMPOSED ESSENTIALLY OF FROM 50 TO 100 MOLE PERCENT OF PRIMARY RECURRING ESTER UNITS HAVING THE FORMUAL:
Claim 2
Dependent Claim
51 words
A HIGHLY POLYMERIC LINEAR POLYESTER CAPABLE OF BEING MELT EXTRUDED INTO FIBERS AND FILM WHICH ARE USEFUL IN THEIR FORM AS EXTRUDED AND COOLED WITHOUT NECESSITY FOR STRETCHING AND HEAT TREATMENT, SAID POLYESTER BEING COMPOSED ESSENTIALLY OF FROM 50 TO 100 MOLE PERCENT OF PRIMARY RECURRING ESTER UNITS HAVING THE FORMUAL:
References Cited (Backward Citations)
GB588833A
Cited
GB644287A
Cited
GB620494A
Cited
US2643989A
Cited
US2614120A
Cited
US2706722A
Cited
US2720507A
Cited
US2744088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |