Patent US3560284A successfully refreshed from Google Patents.
US3000876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stable cellulose acetate sulfates
Assignee: Eastman Kodak Co
•
Filing: 1959-05-14
•
Granted: 1961-09-19
•
Expires: 1979-05-14
Abstract
No abstract record available.
Inventors
- 👤 George P Touey
- 👤 John E Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:58
CPC Classifications
C; C08; C08B; C08B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A WATER SOLUBLE CELLULOSE ACYL SULFATE SALT HAVING A COMBINED SULFUR CONTENT OF AT LEAST 5% CONTAINING A STABILIZING AMOUNT OF UREA.
Claim 2
Dependent Claim
22 words
A WATER SOLUBLE CELLULOSE ACYL SULFATE SALT HAVING A COMBINED SULFUR CONTENT OF AT LEAST 5% CONTAINING A STABILIZING AMOUNT OF UREA.
References Cited (Backward Citations)
US1607474A
Cited
US1866532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |