US3238283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing shaped products of polyvinyl alcohol
Assignee: Kurashiki Rayon Co Ltd
•
Filing: 1961-11-16
•
Granted: 1966-03-01
•
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 18:10
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.
References Cited (Backward Citations)
GB482216A
Cited
US2610359A
Cited
US2700035A
Cited
US2936488A
Cited
US3067185A
Cited
US3111508A
Cited
US3105065A
Cited
US3134758A
Cited
US3041324A
Cited
US3063787A
Cited
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 |