US2962765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved production of regenerated cellulose film by the cuprammonium process
Assignee: JP Bemberg AG
•
Filing: 1957-03-26
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Granted: 1960-12-06
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Expires: 1977-03-26
Abstract
No abstract record available.
Inventors
- 👤 Koren Heribert
- 👤 Schubert Paul
- 👤 Linder Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:17
CPC Classifications
B; B29; B29D; B29D7/00; B29D7/01; B29K; B29K2001/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
IN THE METHOD OF PRODUCING A CELLULOSE FILM BY THE CUPRAMMONIUM PROCESS, THE IMPROVEMENT WHICH COMPRISES: EXTRUDING A CUPRAMMONIUM CELLULOSE SOLUTION AS A FILM OF UNIFORM THICKNESS AND AT A UNIFORM EXTRUSION SPEED, DRAWING OFF THE EXTRUDED FILM AT A SPEED OF ABOUT 1 TO NOT GREATER THAN 1.5 TIMES THE EXTRUSION SPEED THROUGH AN AQUEOUS COAGULATING BATH HAVING AN ALKALINE CONCENTRATION EQUAL TO 5-12% BY WEIGHT OF SODIUM HYDROXIDE, CONDUCTING THE COAGULATED FILM TO AN ACID BATH WHILE SUBSTANTIALLY AVOIDING A LONGITUDINAL STRETCHING TENSION AND A REDUCTION OF SWELLING OF THE FILM, DRAWING THE
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US2115132A
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US2144356A
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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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |