Patent US2991510A successfully refreshed from Google Patents.
US2991510A
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US
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Regenerated cellulose film and process
Assignee: EIDP Inc
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Filing: 1958-08-25
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Granted: 1961-07-11
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Expires: 1978-08-25
Abstract
No abstract record available.
Inventors
- 👤 Ingersoll Henry Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:24
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C08J2301/00; C08J2301/08; C08J2301/22; C08J2301/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
THE PROCESS WHICH COMPRISES CONTINUOUSLY CASTING A FILM OF VISCOSE PREPARED WITH FROM 42% TO 48% BY WEIGHT OF CARBON DISULFIDE BASED ON THE WEIGHT OF THE DRY CELLULOSE AND HAVING A SALT INDEX OF FROM 11.5 TO 12.5 INTO AN AQUEOUS BUFFER SOLUTION BUFFERED TO A PH OF FROM 7 TO 9, SAID BATH CONTAINING AN ANIONIC WETTING AGENT, AND MAINTAINED AT A TEMPERATURE OF FROM 30* TO 50*C., TO COAGULATE WITHOUT SUBSTANTIALLY REGENERATING THE VISCOSE FILM, AND THEREAFTER SUBJECTING SAID FILM, WITHOUT SUBSTANTIALLY STRETCHING SAID FILM, TO THE ACTION OF AN ACID-SALT BATH EFFECTIVE TO REGENERATE THE CELLULOSE WHEREBY TO FORM A REGENERATED CELLULOSE FILM CHARACTERIZED BY HIGH TEAR RESISTANCE AND HIGH DURABILITY UNDER CONDITIONS OF LOW TEMPERATURE AND LOW HUMIDITY.
References Cited (Backward Citations)
US2144356A
Cited
US2313520A
Cited
US2338182A
Cited
US2422021A
Cited
US2297746A
Cited
US2412969A
Cited
US2581835A
Cited
GB648865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |