Patent US2457751A successfully refreshed from Google Patents.
Patent US2909508A successfully refreshed from Google Patents.
US2909508A
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Copolymers of acrylamide and vinyl aromatic sulfonates
Assignee: Dow Chemical Co
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Filing: 1956-03-12
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Granted: 1959-10-20
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Expires: 1976-03-12
Abstract
No abstract record available.
Inventors
- 👤 Giffin D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:41
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A COPOLYMER OF FROM 99 TO 90 MOLE PERCENT OF ARCYLAMIDE AND A TOTAL OF FROM 1 TO 10 MOLE PERCEN OF AT LEAST ONE MONOVINYL AROMATIC SULFONATE SELECTED FROM THE CLASS CONSISTING OF VINYLBENZYLSULFONIC ACID, VINYLBENZWNESULFONIC ACID, ALKALI AND ALKALINE EARTH METAL SALTS OF SAID ACIDS, AND ALKYLATED DERIVATIVES OF SAID ACIDS AND SALTS HAVING FROM 1 TO 2 ALKYL RADICALS, EACH CONTAINING FROM 1 TO 3 CARBON ATOMS, ATTACHED TO THE BENZENE NUCLEUS.
Claim 2
Dependent Claim
75 words
A COPOLYMER OF FROM 99 TO 90 MOLE PERCENT OF ARCYLAMIDE AND A TOTAL OF FROM 1 TO 10 MOLE PERCEN OF AT LEAST ONE MONOVINYL AROMATIC SULFONATE SELECTED FROM THE CLASS CONSISTING OF VINYLBENZYLSULFONIC ACID, VINYLBENZWNESULFONIC ACID, ALKALI AND ALKALINE EARTH METAL SALTS OF SAID ACIDS, AND ALKYLATED DERIVATIVES OF SAID ACIDS AND SALTS HAVING FROM 1 TO 2 ALKYL RADICALS, EACH CONTAINING FROM 1 TO 3 CARBON ATOMS, ATTACHED TO THE BENZENE NUCLEUS.
References Cited (Backward Citations)
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Cited
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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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |