US3637564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dissolution of polyacrylamides
Assignee: Wyeth Holdings LLC
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Filing: 1969-07-22
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Granted: 1972-01-25
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Expires: 1989-07-22
Abstract
Abstract THE DISSOLUTION OF DRY PARTICULATE ANIONIC VINYL POLYMERS IN WATER IS ACCELERATED WHEN THE WATER HAS A DISSOLVED CONTENT OF A CATIONIC POLYAMINE AND AN IONIZATION SUPPRESSOR FOR THE ANIONIC SUBSTITUENT OF THE POLYMER.
Inventors
- 👤 Peter Economou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:36
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; C08J2333/00; C08J2333/24; C08J2333/26
Claims Analysis
Total Claims: 0
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |