Patent US3313639A successfully refreshed from Google Patents.
US3313639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose acyl ester film-forming composition
Assignee: Eastman Kodak Co
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Filing: 1963-08-28
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Granted: 1967-04-11
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Expires: 1983-08-28
Abstract
No abstract record available.
Inventors
- 👤 Frederick M Ball
- 👤 John H Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:53
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08K5/15; C08K5/151; C08K5/1545
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A FILM HAVING HIGH TENSILE STRENGTH AND EXCELLENT CLARITY AT LOW TEMPERATURE, CONSISTING ESSENTIALLY OF WEIGHT OF A CELLULOSE ESTER CONTAINING 30-50% ACYL RADICALS OF 3-4 CARBON ATOMS, 0-5% ACETYL AND A VISCOSITY OF 0.1 TO 20 SECONDS; 20-60 PARTS BY WEIGHT OF ACYL TRIALKYL CITRATE, SAID ACYL GROUPS CONTAINING 1-6 CARBON ATOMS AND SAID ALKYL GROUPS EACH CONTAINING 1-6 CARBON ATOMS; AND, 10-30 PARTS BY WEIGHT SUCROSE ACETATE ISOBUTYRATE.
Claim 2
Dependent Claim
70 words
A FILM HAVING HIGH TENSILE STRENGTH AND EXCELLENT CLARITY AT LOW TEMPERATURE, CONSISTING ESSENTIALLY OF WEIGHT OF A CELLULOSE ESTER CONTAINING 30-50% ACYL RADICALS OF 3-4 CARBON ATOMS, 0-5% ACETYL AND A VISCOSITY OF 0.1 TO 20 SECONDS; 20-60 PARTS BY WEIGHT OF ACYL TRIALKYL CITRATE, SAID ACYL GROUPS CONTAINING 1-6 CARBON ATOMS AND SAID ALKYL GROUPS EACH CONTAINING 1-6 CARBON ATOMS; AND, 10-30 PARTS BY WEIGHT SUCROSE ACETATE ISOBUTYRATE.
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |