US3240738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol spinning composition and method
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1961-09-20
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Granted: 1966-03-15
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Expires: 1981-09-20
Abstract
No abstract record available.
Inventors
- 👤 Mitamura Akio
- 👤 Akabane Takeshi
- 👤 Kawai Kigen
- 👤 Morimoto Osamu
- 👤 Ashikaga Tadao
- 👤 Tanabe Kenichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:33
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN THE MANUFACTURE OF POLYVINYL ALCOHOL FIBERS, THE STEPS WHICH COMPRISE PREPARING A SPINNING COMPOSITION OF GOOD SPINNING CHARACTERISTICS COMPRISING AN AQUEOUS MIXTURE OF POLYVINYL ALCOHOL AND A MINOR AMOUNT BUT AT LEAST ABOUT 0.02% BY WEIGHT OF SAID POLYVINYL ALCOHOL OF UREA DERIVATIVE, AND SPINNING SAID COMPOSITION TO FORM FIBERS THEREFROM, SAID UREA DERIVATIVE BEING SELECTED FROM THE GROUP CONSISTING OF THIOUREA, CYCLIC ETHYLENE THIOUREA, CYCLIC PROPYLENE THIOUREA, CYCLIC ETHYLENE UREA, CYCLIC PROPYLENE UREA, TRIAZONE, AND THE WATER-SOLUBLE OXY-, ALKYL-, AND ARYL-DERIVATIVES THEREOF.
Claim 2
Dependent Claim
84 words
IN THE MANUFACTURE OF POLYVINYL ALCOHOL FIBERS, THE STEPS WHICH COMPRISE PREPARING A SPINNING COMPOSITION OF GOOD SPINNING CHARACTERISTICS COMPRISING AN AQUEOUS MIXTURE OF POLYVINYL ALCOHOL AND A MINOR AMOUNT BUT AT LEAST ABOUT 0.02% BY WEIGHT OF SAID POLYVINYL ALCOHOL OF UREA DERIVATIVE, AND SPINNING SAID COMPOSITION TO FORM FIBERS THEREFROM, SAID UREA DERIVATIVE BEING SELECTED FROM THE GROUP CONSISTING OF THIOUREA, CYCLIC ETHYLENE THIOUREA, CYCLIC PROPYLENE THIOUREA, CYCLIC ETHYLENE UREA, CYCLIC PROPYLENE UREA, TRIAZONE, AND THE WATER-SOLUBLE OXY-, ALKYL-, AND ARYL-DERIVATIVES THEREOF.
References Cited (Backward Citations)
US2430499A
Cited
US2890180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |