Patent US4221813A successfully refreshed from Google Patents.
US3032385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of wet spinning polyvinyl alcohol
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1959-04-03
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Granted: 1962-05-01
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Expires: 1979-04-03
Abstract
No abstract record available.
Inventors
- 👤 Osugi Tetsuro
- 👤 Tanabe Kenichi
- 👤 Mochizuki Takani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:22
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF PREPARING IMPROVED POLYVINYL ALCOHOL FIBERS WHICH COMPRISES FORMING AN AQUEOUS POLYVINYL ALCOHOL SPINNING SOLUTION, EXTRUDING THE SAID SPINNING SOLUTION IN THE FORM OF FINE STREAMS INTO A WARM COAGULATING SALT SOLUTION BATH HAVING A TEMPERATURE ABOVE 72*C., COAGULATING THE SAID FINE STREAMS IN SAID WARM COAGULATING SOLUTION TO FORM FILAMENTS, CONTACTING THE SAID FILAMENTS WITH A COOL COAGULATING SOLUTION BATH HAVING A TEMPERA-
Claim 2
Independent Claim
66 words
THE METHOD OF PREPARING IMPROVED POLYVINYL ALCOHOL FIBERS WHICH COMPRISES FORMING AN AQUEOUS POLYVINYL ALCOHOL SPINNING SOLUTION, EXTRUDING THE SAID SPINNING SOLUTION IN THE FORM OF FINE STREAMS INTO A WARM COAGULATING SALT SOLUTION BATH HAVING A TEMPERATURE ABOVE 72*C., COAGULATING THE SAID FINE STREAMS IN SAID WARM COAGULATING SOLUTION TO FORM FILAMENTS, CONTACTING THE SAID FILAMENTS WITH A COOL COAGULATING SOLUTION BATH HAVING A TEMPERA-
References Cited (Backward Citations)
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Cited
US2610359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |