US3297640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulfones of bicyclo [3.2.0] hept-2-en-6-one and derivatives
Assignee: Eastman Kodak Co
•
Filing: 1963-05-15
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Granted: 1967-01-10
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Expires: 1983-05-15
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 Edward H Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:00
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A POLYSULFONE RESIN PREPARED BY REACTING SULFUR DIOXIDE AND A COMPONENT CONSISTING OF AT LEAST ONE COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
23 words
A POLYSULFONE RESIN PREPARED BY REACTING SULFUR DIOXIDE AND A COMPONENT CONSISTING OF AT LEAST ONE COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2899412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |