US3121762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing regenerated cellulose film
Assignee: EIDP Inc
•
Filing: 1961-07-17
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Granted: 1964-02-18
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Expires: 1981-07-17
Abstract
No abstract record available.
Inventors
- 👤 Hafstad Jakob
- 👤 Wilson Kenneth Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:29
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/919; B29C48/03; B29C48/09; B29C48/10; B29C48/12; B29C48/30; B29C48/32; B29C48/33; B29C48/001; B29C48/0018; B29C48/0019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PROCESS WHICH COMPRISES THE STEPS OF EXTRUDING VISCOSE IN THE FORM OF A TUBULAR FILM INTO A COAGULATING BATH IN A MANNER TO PROVIDE AT LEAST ONE LONGITUDINAL LANE IN SAID FILM IN WHICH THE WALL THICKNESS IS LESS THAN THE WALL THICKNESS OF THE REMAINDER OF THE FILM; ADVANCING SAID TUBULAR FILM THROUGH SAID BATH TO PROVIDE A GEL TUBULAR FILM; EXPANDING THE TUBULAR FILM; SLITTING THE TUBULAR FILM ALONG THE CENTER OF SAID LONGITUDINAL LANE OF RELATIVELY THIN WALL THICKNESS TO PROVIDE AT LEAST ONE FLAT SHEET OF FILM HAVING RELATIVELY THIN EDGE LANES; REGENERATING SAID FILM AND, SUBSEQUENT TO REGENERATION, PURIFYING, SOFTENING AND DRYING SAID FILM.
Claim 2
Dependent Claim
110 words
A PROCESS WHICH COMPRISES THE STEPS OF EXTRUDING VISCOSE IN THE FORM OF A TUBULAR FILM INTO A COAGULATING BATH IN A MANNER TO PROVIDE AT LEAST ONE LONGITUDINAL LANE IN SAID FILM IN WHICH THE WALL THICKNESS IS LESS THAN THE WALL THICKNESS OF THE REMAINDER OF THE FILM; ADVANCING SAID TUBULAR FILM THROUGH SAID BATH TO PROVIDE A GEL TUBULAR FILM; EXPANDING THE TUBULAR FILM; SLITTING THE TUBULAR FILM ALONG THE CENTER OF SAID LONGITUDINAL LANE OF RELATIVELY THIN WALL THICKNESS TO PROVIDE AT LEAST ONE FLAT SHEET OF FILM HAVING RELATIVELY THIN EDGE LANES; REGENERATING SAID FILM AND, SUBSEQUENT TO REGENERATION, PURIFYING, SOFTENING AND DRYING SAID FILM.
References Cited (Backward Citations)
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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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |