Patent US3557262A successfully refreshed from Google Patents.
US3557262A
Expired / Lapsed
US
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Method of preparing transparent cellulosic film
Assignee: Rayonier Inc
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Filing: 1968-05-10
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Granted: 1971-01-19
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Expires: 1988-05-10
Abstract
Abstract TRANSPARENT CELLULOSIC FILM HAVING A LONGITUDINALLY EXTENDING CENTER PORTION COMPRISING REGERNATED CELLULOSE AND INTEGRALLY FORMED LONGITUDINALLY EXTENDING EDGE PORTIONS COMPRISING HYDROXYETHYLCELLULOSE (HEC) IS PRODUCED BY EXTRUDING A VISCOSE CASTING SOLUTION THROUGH THE CENTER PORTION OF THE FILM EXTRUSION SLIT OF A VISCOSE CASTING HOPPER WHILE CONCURRENTLY EXTRUDING AN HEC CASTING SOLUTION THROUGH THE IMMEDIATELY ADJOINING EDGE PORTIONS OF SAID FILM EXTRUSION SLIT, SAID SOLUTIONS BEING EXTRUDED INTO A CONVENTIONAL ACIDIC REGENERATION BATH TO FORM THE AFORESAID MULTI-COMPONENT FILM OF REGENERATED CELLULOSIC MATERIAL.
Inventors
- 👤 Reid L Mitchell
- 👤 Charles F Murphy
- 👤 Edmund M La Polla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:29
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C2793/00; B29C2793/0063; B29C48/001; B29C48/0022; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |