Patent US3198651A successfully refreshed from Google Patents.
US3198651A
Expired / Lapsed
US
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Treatment of water-resistant acetalized polyvinyl alcohol fibers with alkali metal boro hydride for improved thermal stability
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1960-04-20
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Granted: 1965-08-03
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Expires: 1980-04-20
Abstract
No abstract record available.
Inventors
- 👤 Shiraishi Makoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:38
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/51; D06M11/55; C; C08; C08K; C08K3/00; C08K3/38; C08L; C08L29/00; C08L29/02; C08L29/04; Y; Y10; Y10S; Y10S8/00; Y10S8/06; Y10S8/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
THE METHOD OF IMPROVING THE THERMAL STABILITY OF WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS WHICH COMPRISES, CONTACTING WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS WITH A TREATING AGENT CONSISTING ESSENTIALLY OF AN INERT SOLVENT SOLUTION OF AN ALKALI METAL BORO HYDRIDE FOR A DURATION OF TIME SUFFICIETN TO RENDER SAID TREATED FIBERS FREE FROM YELLOWING WHEN SUBJECTED TO RELATIVELY HIGH TEMPERATURES, ACIDIFYING SAID TREATED FIBERS TO REMOVE EXCESS ALKALI METAL BORO HYDRIDE FROM SAID TREATED FIBERS, WASHING SAID ACIDIFIED FIBERS THROUGHLY WITH WATER, AND DRYING SAID WASHED FIBERS TO OBTAIN SAID WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS HAVING IMPROVED THERMAL STABILITY.
Claim 2
Independent Claim
97 words
THE METHOD OF IMPROVING THE THERMAL STABILITY OF WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS WHICH COMPRISES, CONTACTING WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS WITH A TREATING AGENT CONSISTING ESSENTIALLY OF AN INERT SOLVENT SOLUTION OF AN ALKALI METAL BORO HYDRIDE FOR A DURATION OF TIME SUFFICIETN TO RENDER SAID TREATED FIBERS FREE FROM YELLOWING WHEN SUBJECTED TO RELATIVELY HIGH TEMPERATURES, ACIDIFYING SAID TREATED FIBERS TO REMOVE EXCESS ALKALI METAL BORO HYDRIDE FROM SAID TREATED FIBERS, WASHING SAID ACIDIFIED FIBERS THROUGHLY WITH WATER, AND DRYING SAID WASHED FIBERS TO OBTAIN SAID WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS HAVING IMPROVED THERMAL STABILITY.
Claim 3
Dependent Claim
38 words
THE METHOD ACCORDING TO CLAIM 1, WHEREIN SAID WATER-RESISTANT ACETALIZED POLYVINYL ALCOHOL FIBERS ARE BLEACHED BY TREATMENT WITH A BLEACHING AGENT PRIOR TO SAID CONTACTING OF SAID FIBERS WITH SID INERT SOLVENT SOLUTION OF ALKALI METAL BORO HYDRIDE.
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |