US3661880A
Expired / Lapsed
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Process for preparing solid watersoluble cationic polymers
Assignee: Roehm GmbH Darmstadt
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Filing: 1969-05-28
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Granted: 1972-05-09
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Expires: 1989-05-28
Abstract
Abstract AN IMPROVED METHOD FOR PREPARING SOLID WATER-SOLUBLE CATIONIC POLYMERS BY POLYMERIZING CONCNETRATED AQUEOUS MONOMER SOLUTIONS IN THIN HORIZONTAL LAYERS BOUNDED BY FLEXIBLE WALLS, AND THEN CONCENTRATING THE RESULTING POLYMER SOLUTIONS BY EVAPORATING WATER DIRECTLY THEREFROM TO FORM NON-ADHERENT SOLIDS EASILY SEPARABLE FROM SAID WALLS.
Inventors
- 👤 Gerhard Markert
- 👤 Horst Pennewis
- 👤 Klaus Ross
- 👤 Dieter Neher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:33
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/60; C08F20/10; C08F20/34; C08F220/00; C08F220/02; C08F220/42; C08F8/00; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17; Y10S260/18; Y10S526/00; Y10S526/923
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |