US3080207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinyl alcohol bodies having improved knot strength
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1959-03-26
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Granted: 1963-03-05
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Expires: 1979-03-26
Abstract
No abstract record available.
Inventors
- 👤 Tanabe Kenichi
- 👤 Ohno Yasuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:17
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/123; Y; Y10; Y10S; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A PROCESS FOR IMPROVING THE KNOT STRENGTH AN ELASTIC RECOVERY OF POLYVINYL ALCOHOL FIBRES WHICH CONSISTS ESSENTIALLY OF RAPIDLY ACETALIZING THE SAID FIBERS BY REACTION WITH AN ALDEHYDE CONSISTING ESSENTIALLY OF AN ALIPHATIC DIALDEHYDE SELECTED FROM THE GROUP CONSISTING OF SUCCINIC DIALEHYDE AND GLUTARIC DIALDEHYDE, IN AN AQUEOUS SOLUTION CONTAINING A HIGH CONCENTRATION OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, PHOSPHORIC ACID, AND HYDROCHLORIC ACID, THE CONCENTRATION OF SULFURIC ACID IN SAID AQUEOUS SOLUTION BEING AT LEAST 8% BY WEIGHT WHEN SULFURIC ACID IS EMPLOYED, THE CONCENTRATION OF HYDROCHLORIC ACID IN SAID SOLUTION BEING AT LEAST 2% BY WEIGHT WHEN HYDROCHLORIC ACID IS EMPLOYED, AND THE CONCENTRATION OF PHOSPHORIC ACID IN SAID SOLUTION BEING AT LEAST 10% BY WEIGHT WHEN PHOSPHORIC ACID IS EMPLOYED, THE ACETALIZATION BEING CARRIED OUT UNTIL THE WEIGHT OF THE FIBERS IS INCREASED DUE TO THE ACETALIZATION BY ABOUT 1 TO 20%, SAID ACETALIZATION BEING CARRIED OUT AT A TEMPETATURE OF 40 TO 70*C.
Claim 2
Dependent Claim
162 words
A PROCESS FOR IMPROVING THE KNOT STRENGTH AN ELASTIC RECOVERY OF POLYVINYL ALCOHOL FIBRES WHICH CONSISTS ESSENTIALLY OF RAPIDLY ACETALIZING THE SAID FIBERS BY REACTION WITH AN ALDEHYDE CONSISTING ESSENTIALLY OF AN ALIPHATIC DIALDEHYDE SELECTED FROM THE GROUP CONSISTING OF SUCCINIC DIALEHYDE AND GLUTARIC DIALDEHYDE, IN AN AQUEOUS SOLUTION CONTAINING A HIGH CONCENTRATION OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, PHOSPHORIC ACID, AND HYDROCHLORIC ACID, THE CONCENTRATION OF SULFURIC ACID IN SAID AQUEOUS SOLUTION BEING AT LEAST 8% BY WEIGHT WHEN SULFURIC ACID IS EMPLOYED, THE CONCENTRATION OF HYDROCHLORIC ACID IN SAID SOLUTION BEING AT LEAST 2% BY WEIGHT WHEN HYDROCHLORIC ACID IS EMPLOYED, AND THE CONCENTRATION OF PHOSPHORIC ACID IN SAID SOLUTION BEING AT LEAST 10% BY WEIGHT WHEN PHOSPHORIC ACID IS EMPLOYED, THE ACETALIZATION BEING CARRIED OUT UNTIL THE WEIGHT OF THE FIBERS IS INCREASED DUE TO THE ACETALIZATION BY ABOUT 1 TO 20%, SAID ACETALIZATION BEING CARRIED OUT AT A TEMPETATURE OF 40 TO 70*C.
References Cited (Backward Citations)
US2636803A
Cited
US2749208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-04 | 1966-09-03 | 1967-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-04 | 1970-09-03 | 1971-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-04 | 1974-09-03 | 1975-03-05 | $7700.00 | Window Closed / Lapsed |