Patent US2761856A successfully refreshed from Google Patents.
US2761856A
Expired / Lapsed
US
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Sulfonated methylol acrylamide copolymers
Assignee: Wyeth Holdings LLC
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Filing: 1952-06-20
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Granted: 1956-09-04
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Expires: 1972-06-20
Abstract
No abstract record available.
Inventors
- 👤 Suen Tzeng-Jiueq
- 👤 Arthur M Schiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A SULFONATED COPOLYMER WHICH COMPRISES THE PRODUCT OF REACTING A SULFUROUS ACID COMPOUND OF THE GROUP CONSISTING OF SULFUROUS ACID AND ITS WATER-SOLUBLE SALTS WITH A COPOLYMER COMPRISING ESSENTIALLY AN AMIDE HAVING THE FORMULA
Claim 2
Dependent Claim
34 words
A SULFONATED COPOLYMER WHICH COMPRISES THE PRODUCT OF REACTING A SULFUROUS ACID COMPOUND OF THE GROUP CONSISTING OF SULFUROUS ACID AND ITS WATER-SOLUBLE SALTS WITH A COPOLYMER COMPRISING ESSENTIALLY AN AMIDE HAVING THE FORMULA
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) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |