Patent US3200178A successfully refreshed from Google Patents.
US3200178A
Expired / Lapsed
US
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Polyvinyl alcohol spinning solutions and fibers produced therefrom
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1961-12-07
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Granted: 1965-08-10
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Expires: 1981-12-07
Abstract
No abstract record available.
Inventors
- 👤 Matsubayashi Kanji
- 👤 Suda Teruo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:19
CPC Classifications
C; C08; C08F; C08F8/00; C08L; C08L29/00; C08L29/02; C08L29/04; D; D01; D01F; D01F6/00; D01F6/28; D01F6/34; Y; Y10; Y10S; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE MANUFACTURE OF POLYVINYL ALCOHOL FIBERS, THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SPINNING SOLUTION COMPRISING A MIXTURE OF POLYVINYL ALCOHOL AND A WATER-SOLUBLE POLYVINYL ALCOHOL DERIVATIVE PRODUCED BY THE REACTION OF POLYVINYL ALCOHOL AND UREA, SAID DERIVATIVE CONTAINING 0.1 TO 6% OF NITROGEN DERIVED FROM SAID UREA, AND THE NITROGEN CONTENT OF THE TOTAL POLYMER COMPONENT OF SAID SOLUTION BEING 0.05 TO 4.5%, AND SPINNING SAID SOLUTION TO FORM FIBERS THEREFROM.
Claim 2
Dependent Claim
73 words
IN THE MANUFACTURE OF POLYVINYL ALCOHOL FIBERS, THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SPINNING SOLUTION COMPRISING A MIXTURE OF POLYVINYL ALCOHOL AND A WATER-SOLUBLE POLYVINYL ALCOHOL DERIVATIVE PRODUCED BY THE REACTION OF POLYVINYL ALCOHOL AND UREA, SAID DERIVATIVE CONTAINING 0.1 TO 6% OF NITROGEN DERIVED FROM SAID UREA, AND THE NITROGEN CONTENT OF THE TOTAL POLYMER COMPONENT OF SAID SOLUTION BEING 0.05 TO 4.5%, AND SPINNING SAID SOLUTION TO FORM FIBERS THEREFROM.
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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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |