US2817649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic polyelectrolytes
Assignee: Monsanto Chemicals Ltd
•
Filing: 1954-04-26
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Granted: 1957-12-24
•
Expires: 1974-04-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Leo L Contois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:25
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS WHICH COMPRISES FORMING A POLYMERIC ADDITION PRODUCT IN THE FORM OF AN ALKALI METAL SALT THEREOF BY REACTING A VINYLIDENE POLYMER, AT LEAST 10% OF THE MONOMER UNITS OF WHICH CONTAIN NITRILE GROUPS, WITH AN ALKALI METAL DERIVATIVE OR OF A DI-N-SUBSTITUTED FORMAMIDE HAVING THE FORMULA
Claim 2
Dependent Claim
24 words
A PROCESS AS IN CLAIM 3 WHEREIN THE VINYLIDENE POLYMER IS POLYACRYLONITRILE AND THE ALKALI METAL DERIVATIVE IS THE SODIUM DERIVATIVE OF N,N-DIMETHYL FORMAMIDE.
References Cited (Backward Citations)
US2054740A
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US2102179A
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FR976959A
Cited
US2648709A
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US2648648A
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US2677706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |