US3108849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing viscose regenerated cellulose fibers
Assignee: Mitsubishi Chemical Corp
•
Filing: 1961-10-25
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Granted: 1963-10-29
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Expires: 1981-10-25
Abstract
No abstract record available.
Inventors
- 👤 Owashi Toshiro
- 👤 Onoe Keigo
- 👤 Ito Hiroshi
- 👤 Kawai Atsushi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:59
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A PROCESS FOR PRODUCING VISCOSE REGENERATED CELLULOSE FIBERS HAVING A DENIER OF 0.5 TO 30, A METHOD COMPRISING EXTRUDING A VISCOSE SOLUTION CONTAINING FROM 3 TO 5% OF ALKALI AND HAVING A VISCOSITY OF FROM 100 TO 500 POISES AND A SALT POINT OF FROM 9 TO 20, INTO A COAGULATING BATH BEING KEPT AT A TEMPERATURE OF FROM 10* TO 30* C. AND CONTAINING FROM 0.02 TO 0.04% OF ZINC SULFATE, FROM 1 TO 10% OF SODIUM SULFATE, AND SULFURIC ACID AT A CONCENTRATION WITHIN THE RANGE DEFINED BY THE EQUATIONS:
Claim 2
Dependent Claim
93 words
IN A PROCESS FOR PRODUCING VISCOSE REGENERATED CELLULOSE FIBERS HAVING A DENIER OF 0.5 TO 30, A METHOD COMPRISING EXTRUDING A VISCOSE SOLUTION CONTAINING FROM 3 TO 5% OF ALKALI AND HAVING A VISCOSITY OF FROM 100 TO 500 POISES AND A SALT POINT OF FROM 9 TO 20, INTO A COAGULATING BATH BEING KEPT AT A TEMPERATURE OF FROM 10* TO 30* C. AND CONTAINING FROM 0.02 TO 0.04% OF ZINC SULFATE, FROM 1 TO 10% OF SODIUM SULFATE, AND SULFURIC ACID AT A CONCENTRATION WITHIN THE RANGE DEFINED BY THE EQUATIONS:
References Cited (Backward Citations)
US2997365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |