Patent US2525676A successfully refreshed from Google Patents.
US2525676A
Expired / Lapsed
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Heat sealable regenerated cellulose film and methods of making same
Assignee: EIDP Inc
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Filing: 1945-03-27
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Granted: 1950-10-10
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Expires: 1965-03-27
Abstract
No abstract record available.
Inventors
- 👤 William A Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:51
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/052; C08J2301/00; C08J2301/06; C08J2431/00; C08J2431/02; C08J2431/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31801; Y10T428/31844; Y10T428/31848; Y10T428/31942; Y10T428/31946
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
THE PROCESS OF RENDERING TRANSPARENT REGENERATED CELLULOSE FILM HEAT SEALABLE WHICH COMPRISES INCORPORATING IN A REGENERATED CELLULOSE FILM AT LEAST 0.05% BY WEIGHT, BASED ON THE WEIGHT OF FILM, OF A WATER-SOLUBLE POLYVINYL ALCOHOL HAVING A HYDROXYL CONTENT FROM 70% TO 96% OF THE THEORETICAL MAXIMUM AND CONTAINING A GROUP FROM THE CLASS CONSISTING OF ESTER, ETHER, ACETAL AND KETAL GROUPS, AND SUFFICIENT WATER-SOLUBLE THERMOSETTING RESIN FROM THE GROUP CONSISTING OF PHENOL-ALDEHYDE, UREA-ALDEHYDE AND AMINE-ALDEHYDE RESINS TO EFFECT HARDEINING OF THE POLYVINYL ALCOHOL, AND HEATING SAID FILM TO CONVERT SAID RESIN TO THE INSOLUBLE STATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |