US2527300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of unsaturated sulfonic acids and polyunsaturated compounds
Assignee: Wyeth Holdings LLC
•
Filing: 1948-03-18
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Granted: 1950-10-24
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Expires: 1968-03-18
Abstract
No abstract record available.
Inventors
- 👤 James R Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:58
CPC Classifications
C; C08; C08F; C08F28/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A GRANULAR, WATER-INSOLUBLE CATION EXCHANGE RESIN ACTIVE FOR THE REMOVAL OF CATIONS FROM SOLUTION WHICH IS A COPOLYMER OF (1) ETHYLENSULFONIC ACID AND (2) N,N''-METHYLENEDIACRYLAMIDE, THE MOLAR RATIO OF (1) TO (2) BEING FROM ABOUT 1:$ TO ABOUAT 20:1.
Claim 2
Dependent Claim
39 words
A GRANULAR, WATER-INSOLUBLE CATION EXCHANGE RESIN ACTIVE FOR THE REMOVAL OF CATIONS FROM SOLUTION WHICH IS A COPOLYMER OF (1) ETHYLENSULFONIC ACID AND (2) N,N''-METHYLENEDIACRYLAMIDE, THE MOLAR RATIO OF (1) TO (2) BEING FROM ABOUT 1:$ TO ABOUAT 20:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |