Patent US2764561A successfully refreshed from Google Patents.
US2764561A
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Resinous insoluble vinyl aromatic copolymer containing phosphonate groups and sulfonate groups
Assignee: Dow Chemical Co
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Filing: 1954-11-02
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Granted: 1956-09-25
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Expires: 1974-11-02
Abstract
No abstract record available.
Inventors
- 👤 Elmer L Mcmaster
- 👤 William K Glesner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:20
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
AN INSOLUBLE RESINOUS COMPOSITION, SUITABLE FOR THE REMOVAL OF CATIONS FROM FLUIDS, COMPRISING AN INSOLUBLE COPOLYMER OF FROM 80 TO 99.5 PER CENT BY WEIGHT OF AT LEAST ONE MONOVINYL AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOVINYL AROMATIC HYDROCARBONS OF THE BENZENE SERIES AND NUCLEAR HALOGENATED DERIVATIVES THREOF, AND FROM 20 TO 0.5 PER CENT OF AT LEAST ONE DIVINYL AROMATIC HYDROCARBON, THE SAID COPOLYMER CONTAINING AS SUBSTITUENTS ON AROMATIC NUCLEI THEREOF AT LEAST 0.5 PHOSPHONATE GROUP AND AT LEAST TWO SULFONATE GROUPS PER TEN AROMATIC NUCLEI.
Claim 2
Dependent Claim
89 words
AN INSOLUBLE RESINOUS COMPOSITION, SUITABLE FOR THE REMOVAL OF CATIONS FROM FLUIDS, COMPRISING AN INSOLUBLE COPOLYMER OF FROM 80 TO 99.5 PER CENT BY WEIGHT OF AT LEAST ONE MONOVINYL AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOVINYL AROMATIC HYDROCARBONS OF THE BENZENE SERIES AND NUCLEAR HALOGENATED DERIVATIVES THREOF, AND FROM 20 TO 0.5 PER CENT OF AT LEAST ONE DIVINYL AROMATIC HYDROCARBON, THE SAID COPOLYMER CONTAINING AS SUBSTITUENTS ON AROMATIC NUCLEI THEREOF AT LEAST 0.5 PHOSPHONATE GROUP AND AT LEAST TWO SULFONATE GROUPS PER TEN AROMATIC NUCLEI.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |