US3170973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing fibers
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1961-02-23
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Granted: 1965-02-23
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Expires: 1981-02-23
Abstract
No abstract record available.
Inventors
- 👤 Tanabe Kenichi
- 👤 Saito Hideo
- 👤 Ashikaga Tadao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:03
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS OF FORMING POLYVINYL ALCOHOL FIBERS OF INCREASED STRENGTH AND HOT-WATER RESISTANCE WHICH COMPRISES INTRODUCING INTO A COAGULATION BATH, AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL CONTAINING AT LEAST ABOUT 0.4% BY WEIGHT OF BORIC ACID TO FORM POLYVINYL ALCOHOL FIBERS THEREFROM, REMOVING THE THUS-FORMED FIBERS FROM THE COAGULATION BATH AND WASHING THE FIBERS BY SOAKING THEM IN RUNNING WATER FOR AT LEAST ABOUT ONE MINUTE TO REMOVE BORIC ACID THEREFROM AND TO RENDER THEM FREE OF FREE BORIC ACID.
Claim 2
Dependent Claim
80 words
A PROCESS OF FORMING POLYVINYL ALCOHOL FIBERS OF INCREASED STRENGTH AND HOT-WATER RESISTANCE WHICH COMPRISES INTRODUCING INTO A COAGULATION BATH, AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL CONTAINING AT LEAST ABOUT 0.4% BY WEIGHT OF BORIC ACID TO FORM POLYVINYL ALCOHOL FIBERS THEREFROM, REMOVING THE THUS-FORMED FIBERS FROM THE COAGULATION BATH AND WASHING THE FIBERS BY SOAKING THEM IN RUNNING WATER FOR AT LEAST ABOUT ONE MINUTE TO REMOVE BORIC ACID THEREFROM AND TO RENDER THEM FREE OF FREE BORIC ACID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |