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Patent US3216983A successfully refreshed from Google Patents.
US3216983A
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Reaction products of polyvinylpyrrolidone compounds and polyisocyanates
Assignee: IND BIOLOGY LAB Inc
•
Filing: 1961-10-23
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Granted: 1965-11-09
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Expires: 1981-10-23
Abstract
No abstract record available.
Inventors
- 👤 Morris V Shelanski
- 👤 Levenson Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6283; A; A01; A01N; A01N59/00; A01N59/12; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/84; A61K8/87; A61Q; A61Q11/00; A61Q3/00; A61Q3/02; A61Q5/00; A61Q5/06; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22; C08F8/30; C08G18/6212
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE REACTION PRODUCT FORMED BY HEATING A MIXTURE OF AN ORGANIC DIISOCYANATE AND A MEMBER OF THE GROUP CONSISTING OF ANHYDROUS POLYVINYLPYRROLIDONE AND ANHYDROUS HYDROLYZED VINYLPYRROLIDONE/VINYL ACETATE COPOLYMER TO A TEMPERATURE OF BETWEEN ABOUT ROOM TEMPERATURE AND 70*C. UNTIL A POLYMER SOLUTION IS FORMED.
Claim 2
Dependent Claim
44 words
THE REACTION PRODUCT FORMED BY HEATING A MIXTURE OF AN ORGANIC DIISOCYANATE AND A MEMBER OF THE GROUP CONSISTING OF ANHYDROUS POLYVINYLPYRROLIDONE AND ANHYDROUS HYDROLYZED VINYLPYRROLIDONE/VINYL ACETATE COPOLYMER TO A TEMPERATURE OF BETWEEN ABOUT ROOM TEMPERATURE AND 70*C. UNTIL A POLYMER SOLUTION IS FORMED.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |