US2968646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyformals of cyclic diols
Assignee: Eastman Kodak Co
•
Filing: 1958-09-30
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Granted: 1961-01-17
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Expires: 1978-09-30
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 Jr Winston J Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:28
CPC Classifications
C; C08; C08G; C08G4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A NORMALLY SOLID LINEAR POLYFORMAL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 10,000 AND CONSISTING ESSENTIALLY OF A RECURRING STRUCTURAL UNIT HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
32 words
A NORMALLY SOLID LINEAR POLYFORMAL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 10,000 AND CONSISTING ESSENTIALLY OF A RECURRING STRUCTURAL UNIT HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US2786081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |