Patent US3033842A successfully refreshed from Google Patents.
US3033842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing water-insoluble polymers of polyvinyl alcohol
Assignee: Evonik Operations GmbH
•
Filing: 1960-01-18
•
Granted: 1962-05-08
•
Expires: 1980-01-18
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Rosemarie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
C; C08; C08F; C08F8/00; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS FOR REDUCING THE WATER SOLUBILITY AND SWELLING CAPACITY OF POLYVINYL ALCOHOL, WHICH COMPRISES CROSS-LINKING BY CONDENSING WATER-CONTAINING POLYVINYL ALCOHOL IN AN ALKALINE MEDIUM WITH CYANURIC CHLORIDE TO CROSS-LINK SAID POLYVINYL ALCOHOL THREE-DIMENSIONALLY.
Claim 2
Dependent Claim
34 words
A PROCESS FOR REDUCING THE WATER SOLUBILITY AND SWELLING CAPACITY OF POLYVINYL ALCOHOL, WHICH COMPRISES CROSS-LINKING BY CONDENSING WATER-CONTAINING POLYVINYL ALCOHOL IN AN ALKALINE MEDIUM WITH CYANURIC CHLORIDE TO CROSS-LINK SAID POLYVINYL ALCOHOL THREE-DIMENSIONALLY.
References Cited (Backward Citations)
US2306410A
Cited
US2169250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |