US3086007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble cellulose acetate propionate sulfate salts and films thereof
Assignee: Eastman Kodak Co
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Filing: 1961-08-01
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Granted: 1963-04-16
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Expires: 1981-08-01
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 18:56
CPC Classifications
C; C08; C08B; C08B7/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
A WATER SOLUBLE CELLULOSE ACETATE PROPIONATE ALKALI METAL SULFATE HAVING THE FORMULA:
Claim 2
Dependent Claim
12 words
A WATER SOLUBLE CELLULOSE ACETATE PROPIONATE ALKALI METAL SULFATE HAVING THE FORMULA:
Claim 3
Independent Claim
85 words
A METHOD OF PREPARING A WATER SOLUBLE SALT OF CELLULOSE ACETATE PROPIONATE SULFATE WHICH COMPIRSES REACTING UPON 1 PART OF CELLULOSE WITH AN ESTERIFICATION BATH ESSENTIALLY CONSISTING OF 2.5 TO 6.0 PARTS OF ACETIC ANHYDRIDE, 2.5 TO 10.0 PARTS OF PROPIONIC ACID, 0.1 TO 0.5 PART OF SODIUM SULFATE AND 0.1 TO 0.7 PART OF SULFURIC ACID, THE SULFURIC ACID BEING IN MOLAR EXCESS OF THE SODIUM SULFATE WITH AT LEAST 0.3 MOL OF SULFATE GROUPS PER MOL OF CELLULOSE PRESENT IN THE REACTION MIXTURE.
Claim 4
Independent Claim
85 words
A METHOD OF PREPARING A WATER SOLUBLE SALT OF CELLULOSE ACETATE PROPIONATE SULFATE WHICH COMPIRSES REACTING UPON 1 PART OF CELLULOSE WITH AN ESTERIFICATION BATH ESSENTIALLY CONSISTING OF 2.5 TO 6.0 PARTS OF ACETIC ANHYDRIDE, 2.5 TO 10.0 PARTS OF PROPIONIC ACID, 0.1 TO 0.5 PART OF SODIUM SULFATE AND 0.1 TO 0.7 PART OF SULFURIC ACID, THE SULFURIC ACID BEING IN MOLAR EXCESS OF THE SODIUM SULFATE WITH AT LEAST 0.3 MOL OF SULFATE GROUPS PER MOL OF CELLULOSE PRESENT IN THE REACTION MIXTURE.
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) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |