US2648611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of urea to viscose
Assignee: Akzo Nobel UK PLC
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Filing: 1947-11-19
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Granted: 1953-08-11
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Expires: 1967-11-19
Abstract
No abstract record available.
Inventors
- 👤 Jr George Alvin Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
AS A FIBER-FORMING COMPOSITION, A MIXTURE OF VISCOSE WITH ABOUT 1 TO 5% BY WEIGHT OF ORGANIC WATER-SOLUBLE MATERIAL CONSISTING OF UREA, THE UREA BEING THE SOLE ORGANIC WATER-SOLUBLE MATERIAL IN THE MIXTURE, SAID COMPOSITION HAVING NORMAL AGEING CHARACTERISTICS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |