Patent US2999760A successfully refreshed from Google Patents.
US2999760A
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Cellulose acetate composition
Assignee: EIDP Inc
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Filing: 1958-05-23
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Granted: 1961-09-12
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Expires: 1978-05-23
Abstract
No abstract record available.
Inventors
- 👤 Cacella Arthur Ferreira
- 👤 White Helen Lyng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:22
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/12; D; D01; D01F; D01F2/00; D01F2/24; D01F2/28; C08J2301/00; C08J2301/08; C08J2301/10; C08J2301/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
A PROCESS FOR THE FORMATION OF A COMPOSITION WHICH COMPRISES CONTACTING AT A TEMPERATURE BELOW ABOUT -20*C., A CELLULOSE ACETATE HAVING A COMBINED ACID VALUE OF FROM 59.8 TO 60.0% WITH A SOLVENT OF METHYL ACETATE AND ACETONE CONTAINING FROM ABOUT 20 TO ABOUT 80% BY WEIGHT OF METHYL ACETATE, AND THEREAFTER RAISING THE TEMPERATURE OF THE MIXTURE UNTIL IT BECOMES A FLUID SOLUTION; THE SAID CELLULOSE ACETATE BEING ADDED SO THAT IT IS PRESENT IN THE COMPOSITION IN AMOUNT OF FROM ABOUT 16 TO ABOUT 18% BY WEIGHT.
References Cited (Backward Citations)
GB128215A
Cited
US2203748A
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US2346350A
Cited
US2362182A
Cited
US2697046A
Cited
US2862785A
Cited
US2839354A
Cited
US2900669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |