US2595779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of halogenated unsaturated polycarboxylic acids and polyunsaturated compounds
Assignee: Wyeth Holdings LLC
•
Filing: 1948-04-03
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Granted: 1952-05-06
•
Expires: 1968-04-03
Abstract
No abstract record available.
Inventors
- 👤 James R Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:47
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A GRANULAR, WATER-INSOLUBLE, CATION EXCHANGE RESIN ACTIVE FOR THE REMOVAL OF CATIONS FROM SOLUTION, SAID RESIN BEING A COPOLYMER OF A MIXTURE CONSISTING OF, AS SOLE POLYMERIZABLE INGREDIENTS, (1) CHLOROMALEIC ANHYDRIDE AND (2) N,N''-METHYLENEDIACRYLAMIDE, THE MOLAR RATIO OF (1) TO (2) BEING FROM 1:1 TO 20:1.
Claim 2
Dependent Claim
46 words
A GRANULAR, WATER-INSOLUBLE, CATION EXCHANGE RESIN ACTIVE FOR THE REMOVAL OF CATIONS FROM SOLUTION, SAID RESIN BEING A COPOLYMER OF A MIXTURE CONSISTING OF, AS SOLE POLYMERIZABLE INGREDIENTS, (1) CHLOROMALEIC ANHYDRIDE AND (2) N,N''-METHYLENEDIACRYLAMIDE, THE MOLAR RATIO OF (1) TO (2) BEING FROM 1:1 TO 20:1.
References Cited (Backward Citations)
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Cited
US2230240A
Cited
US2409861A
Cited
US2340110A
Cited
US2437962A
Cited
US2475846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-06 | 1955-11-05 | 1956-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-06 | 1959-11-05 | 1960-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-06 | 1963-11-05 | 1964-05-06 | $7700.00 | Window Closed / Lapsed |