US2840533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion-exchange resins containing weakly and strongly basic functional groups
Assignee: Rohm and Haas Co
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Filing: 1954-05-20
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Granted: 1958-06-24
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Expires: 1974-05-20
Abstract
No abstract record available.
Inventors
- 👤 Jesse C H Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:13
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
AN ANION-EXCHANGE RESIN CONTAINING BOTH WEAKLY BASIC ANION-ADSORBING GROUPS AND STRONGLY BASIC QUATERNARY AMMONIUM ANION-ADSORBING GROUPS WHICH COMPRISES AN INSOLUBLE, CROSS-LINKED COPOLYMER OF 98-99% OF A MONOVINYL HYDROCARBON AND 0.5-2% FO A POLYVINYLIDENE COMPOUND, SAID COPOLYMER CONTAINING ON THE AROMATIC NUCLEI SUBSTITUENT GROUPS HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
47 words
AN ANION-EXCHANGE RESIN CONTAINING BOTH WEAKLY BASIC ANION-ADSORBING GROUPS AND STRONGLY BASIC QUATERNARY AMMONIUM ANION-ADSORBING GROUPS WHICH COMPRISES AN INSOLUBLE, CROSS-LINKED COPOLYMER OF 98-99% OF A MONOVINYL HYDROCARBON AND 0.5-2% FO A POLYVINYLIDENE COMPOUND, SAID COPOLYMER CONTAINING ON THE AROMATIC NUCLEI SUBSTITUENT GROUPS HAVING THE GENERAL 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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |