Patent US3353754A successfully refreshed from Google Patents.
Patent US3238283A successfully refreshed from Google Patents.
US3238283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing shaped products of polyvinyl alcohol
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1961-11-16
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Granted: 1966-03-01
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Expires: 1981-11-16
Abstract
No abstract record available.
Inventors
- 👤 Fujii Kiyoshi
- 👤 Inoue Takeshi
- 👤 Ukida Junji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:54
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A METHOD OF PRODUCING A SHAPED POLYVINYL ALCOHOL PRODUCT HAVING STRONG RESISTANCE TO HOT WATER AND EXCELLENT MECHANICAL PROPERTIES WHICH COMPRISES PREPARING A SHAPED FORM POLYVINYL FORMATE PRODUCT, SAID POLYVINYL FORMATE HAVING BEEN PRODUCED BY POLYMERIZATION OF VINYL FORMATE MONOMER AT A TEMPERATURE BELOW 40*C., SAPONIFYING SAID SHAPED POLYVINYL FORMATE PRODUCT IN THE PRESENCE OF A SAPONIFICATION CATALYST TO CONVERT SAID SHAPED POLYVINYL FORMATE PRODUCT TO POLYVINYL ALCOHOL HAVING THE SAME SHAPED FORM AS SAID POLYVINYL FORMATE PRODUCT, SAID POLYVINYL FORMATE PRODUCT BEING MAINTAIONED AT A LENGTH SUBSTANTIALLY EQUIVALENT TO ITS ORIGINAL LENGTH PRIOR TO SAID SAPONIFICATION, RINSING AND DRYING SAID SHAPED FORM POLYVINYL ALCOHOL, ELONGATING SAID SHAPED FORM POLYVINYL ALCOHOL TO A LENGTH WHICH IS ABOUT 5 TO ABOUT 20 TIMES THE ORIGINAL LENGTH OF SAID SHAPED FORM POLYVINYL ALCOHOL AT A TEMPERATURE OF ABOUT 220*C. TO ABOUT 270*C., AND THERMALLY CONTRACTING SAID SHAPED FORM POLYVINYL ALCOHOL AT A TEMPERATURE OF ABOUT 210*C. TO ABOUT 260*C. TO PRODUCE A POLYVINYL ALCOHOL PRODUCT THAT HAS AN ULTIMATE ELONGATION OF MORE THAN 5 TIMES THAT OF THE ORIGINAL SHAPED FORM POLYVINYL ALCOHOL.
Claim 2
Independent Claim
181 words
A METHOD OF PRODUCING A SHAPED POLYVINYL ALCOHOL PRODUCT HAVING STRONG RESISTANCE TO HOT WATER AND EXCELLENT MECHANICAL PROPERTIES WHICH COMPRISES PREPARING A SHAPED FORM POLYVINYL FORMATE PRODUCT, SAID POLYVINYL FORMATE HAVING BEEN PRODUCED BY POLYMERIZATION OF VINYL FORMATE MONOMER AT A TEMPERATURE BELOW 40*C., SAPONIFYING SAID SHAPED POLYVINYL FORMATE PRODUCT IN THE PRESENCE OF A SAPONIFICATION CATALYST TO CONVERT SAID SHAPED POLYVINYL FORMATE PRODUCT TO POLYVINYL ALCOHOL HAVING THE SAME SHAPED FORM AS SAID POLYVINYL FORMATE PRODUCT, SAID POLYVINYL FORMATE PRODUCT BEING MAINTAIONED AT A LENGTH SUBSTANTIALLY EQUIVALENT TO ITS ORIGINAL LENGTH PRIOR TO SAID SAPONIFICATION, RINSING AND DRYING SAID SHAPED FORM POLYVINYL ALCOHOL, ELONGATING SAID SHAPED FORM POLYVINYL ALCOHOL TO A LENGTH WHICH IS ABOUT 5 TO ABOUT 20 TIMES THE ORIGINAL LENGTH OF SAID SHAPED FORM POLYVINYL ALCOHOL AT A TEMPERATURE OF ABOUT 220*C. TO ABOUT 270*C., AND THERMALLY CONTRACTING SAID SHAPED FORM POLYVINYL ALCOHOL AT A TEMPERATURE OF ABOUT 210*C. TO ABOUT 260*C. TO PRODUCE A POLYVINYL ALCOHOL PRODUCT THAT HAS AN ULTIMATE ELONGATION OF MORE THAN 5 TIMES THAT OF THE ORIGINAL SHAPED FORM POLYVINYL ALCOHOL.
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |