US2985647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of viscose spinning solution
Assignee: Individual
•
Filing: 1959-01-12
•
Granted: 1961-05-23
•
Expires: 1979-01-12
Abstract
No abstract record available.
Inventors
- 👤 Kohorn Oscar Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:41
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A METHOD OF MAKING CELLULOSE XANTHATE, WHICH CONSISTS IN MIXING CRUMBS OF AGED ALKALI-CELLULOSE WITH FROM 10% TO 15% OF THEIR WEIGHT OF LIQUID CARBON BISULFIDE, AT 26*C. TO 36*C., SAID CRUMBS HAVING SUBSTANTIALLY 10% TO 14% OF SODIUM HYDROXIDE BY WEIGHT.
Claim 2
Independent Claim
42 words
A METHOD OF MAKING CELLULOSE XANTHATE, WHICH CONSISTS IN MIXING CRUMBS OF AGED ALKALI-CELLULOSE WITH FROM 10% TO 15% OF THEIR WEIGHT OF LIQUID CARBON BISULFIDE, AT 26*C. TO 36*C., SAID CRUMBS HAVING SUBSTANTIALLY 10% TO 14% OF SODIUM HYDROXIDE BY WEIGHT.
References Cited (Backward Citations)
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US1957707A
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US2057019A
Cited
US2068631A
Cited
US2139302A
Cited
US2112576A
Cited
US2845416A
Cited
US2810658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |