US3335128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of mixed salts of watersoluble cellulose derivatives
Assignee: Eastman Kodak Co
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Filing: 1961-09-11
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Granted: 1967-08-08
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Gordon D Hiatt
- 👤 Martin E Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:06
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/14; C08B13/00; C08B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A MIXED SALT OF A SULFURIC ACID ESTER OF CELLULOSE HAVING A SULFUR CONTENT OF AT LEAST ABOUT 5%, ABOUT 1060% OF SAID MIXED SALT CONTAINS MULTIVALENT SALT FORMING CATION AND THE REMAINDER OF SAID MIXED SALT CONTAINS MONOVALENT CATION.
Claim 2
Dependent Claim
40 words
A MIXED SALT OF A SULFURIC ACID ESTER OF CELLULOSE HAVING A SULFUR CONTENT OF AT LEAST ABOUT 5%, ABOUT 1060% OF SAID MIXED SALT CONTAINS MULTIVALENT SALT FORMING CATION AND THE REMAINDER OF SAID MIXED SALT CONTAINS MONOVALENT CATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |