US3152102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble polyvinyl alcohol-urea reaction products
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1961-12-01
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Granted: 1964-10-06
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Expires: 1981-12-01
Abstract
No abstract record available.
Inventors
- 👤 Suzumura Hideo
- 👤 Hirano Katsuaki
- 👤 Chiba Teiichiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:02
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/21; C08F; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS OF MAKING A POLYVINYL ALCOHOL-UREA REACTION PRODUCT WHICH IS READILY SOLUBLE IN WATER WHICH CONSISTS OF, PREPARING A MIXTURE CONSISTING OF POLYVINYL ALCOHOL AND UREA WHEREBY SAID MIXTURE HAS A MAXIMUM MOISTURE CONTENT OF 8% BASED ON THE WEIGHT OF SAID MIXTURE, SAID UREA IN SAID MIXTURE BEING PRESENT IN AN AMOUNT NOT EXCEEDING 50% BY WEIGHT BASED ON THE WEIGHT OF SAID POLYVINYL ALCOHOL IN SAID MIXTURE, HEATING SAID MIXTURE AT A TEMPERATURE OF 150*C. TO 230*C. IN A REACTION ZONE WHEREBY SAID POLYVINYL ALCOHOL AND SAID UREA REACT, MAINTAINING AN INERT ENVIRONMENT IN SAID REACTION ZONE DURING THE SAID HEATING OF SAID MIXTURE WHEREBY FREE CONTACT OF SAID MIXTURE WITH AIR IS PREVENTED, AND RECOVERING FROM SAID REACTION ZONE SAID POLYVINYL ALCOHOL-UREA REACTION PRODUCT WHICH IS READILY SOLUBLE IN WATER.
Claim 2
Dependent Claim
134 words
A PROCESS OF MAKING A POLYVINYL ALCOHOL-UREA REACTION PRODUCT WHICH IS READILY SOLUBLE IN WATER WHICH CONSISTS OF, PREPARING A MIXTURE CONSISTING OF POLYVINYL ALCOHOL AND UREA WHEREBY SAID MIXTURE HAS A MAXIMUM MOISTURE CONTENT OF 8% BASED ON THE WEIGHT OF SAID MIXTURE, SAID UREA IN SAID MIXTURE BEING PRESENT IN AN AMOUNT NOT EXCEEDING 50% BY WEIGHT BASED ON THE WEIGHT OF SAID POLYVINYL ALCOHOL IN SAID MIXTURE, HEATING SAID MIXTURE AT A TEMPERATURE OF 150*C. TO 230*C. IN A REACTION ZONE WHEREBY SAID POLYVINYL ALCOHOL AND SAID UREA REACT, MAINTAINING AN INERT ENVIRONMENT IN SAID REACTION ZONE DURING THE SAID HEATING OF SAID MIXTURE WHEREBY FREE CONTACT OF SAID MIXTURE WITH AIR IS PREVENTED, AND RECOVERING FROM SAID REACTION ZONE SAID POLYVINYL ALCOHOL-UREA REACTION PRODUCT WHICH IS READILY SOLUBLE IN WATER.
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) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |