US2987371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of rayon
Assignee: Akzona Inc
•
Filing: 1957-12-26
•
Granted: 1961-06-06
•
Expires: 1977-12-26
Abstract
No abstract record available.
Inventors
- 👤 Charles L Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:40
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR PRODUCING HIGH STRENGHT, LOW ELONGATION, VISCOSE RAYON YARN AND FIBER WHICH COMPRISES EXTRUDING A VISCOSE SOLUTION HAVING AN ALKALI CONTENT BE TWEEN 4.8-7.5% BY WEIGHT, INTO FILAMENTS IN AN AQUEOUS ACID BATH CONTAINING NA2SO4, 0.1-2.0% BY WEIGHT OF ZNSO4, AND H2SO4 IN A CONCENTRATION WHICH, FOR ANY GIVEN VISCOSE ALKALI AND ZNSO4 COMBINATION WITHIN THEIR RESPECTIVE RANGES, IS EXPRESSED BY THE FOLLOWING EQUATIONS:
Claim 2
Dependent Claim
66 words
A PROCESS FOR PRODUCING HIGH STRENGHT, LOW ELONGATION, VISCOSE RAYON YARN AND FIBER WHICH COMPRISES EXTRUDING A VISCOSE SOLUTION HAVING AN ALKALI CONTENT BE TWEEN 4.8-7.5% BY WEIGHT, INTO FILAMENTS IN AN AQUEOUS ACID BATH CONTAINING NA2SO4, 0.1-2.0% BY WEIGHT OF ZNSO4, AND H2SO4 IN A CONCENTRATION WHICH, FOR ANY GIVEN VISCOSE ALKALI AND ZNSO4 COMBINATION WITHIN THEIR RESPECTIVE RANGES, IS EXPRESSED BY THE FOLLOWING EQUATIONS:
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |