Patent US3887499A successfully refreshed from Google Patents.
US3887499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation exchange membranes having carboxylic and sulfonic acid functionality
Assignee: Veolia WTS Systems USA Inc
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Filing: 1973-08-23
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Granted: 1975-06-03
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Expires: 1993-08-23
Abstract
Abstract A cation exchange membrane containing functional groups of both the sulfonic acid and carboxylic acid radicals which allows the membranes to maintain its conductivity throughout the entire pH range. This unique property gives this high capacity pH insensitive membrane particular value in electrolytic cells as hydraulic diaphragms to separate a basic solution from an acid solution as is encountered in caustic-chlorine cells or other type cells which electrolytically decompose neutral salt solutions such as sodium sulfate into their basic and acidic components of caustic soda and sodium acid sulfate. The capacity of this membrane is much higher than the presently known sulfonic acid salt types.
Inventors
- 👤 Jr Russell B Hodgdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:48
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A SOLID BIFUNCTIONAL CATION SELECTIVE MEMBRANE HAVING AT LEAST TWO DIMENSIONS IN EXCESS OF ONE CM. COMPRISING A CROSSLINKED POLYMER MATRIX BONDED TO BOTH CARBOXYLIC ACID AND SULFONIC ACID FUNCTIONAL GROUPS, SAID MATRIX BEING A POLYMERIZED PRODUCT OF A SOLUTION MIXTURE OF AT LEAST ONE MONVINYL AROMATIC MONOMER, AT LEAST ONE POLYVINYL AROMATIC MONOMER, AT LEAST ONE OLEFINIC CARBOXYLIC MONOMER AND A NONPOLYMERIZABLE ORGANIC HYDROCARBON SOLVENT, SAID MIXTURE CONTAINING SAID POLYVINYL MONOMER BETWEEN 40-50 MOLE % OF THE TOTAL POLYMERIZABLE MONOMERS AND BETWEEN 20-50% BY VOLUME OF SAID NON-POLYMERIZABLE SOLVENT, THE SAID SULFONIC ACID GROUPS BEING CHEMICALLY BOUNDED TO THE VINYL AROMATIC NUCLEI OF SAID POLYMER MATRIX IN AN AMOUNT AVERAGING 0.65 TO 1.2 GROUPS FOR EVERY CARBOXYLIC ACID GROUP CONTAINING THEREIN AND THEREIN THE MOLE RATIO OF THE MONOVINYL MONOMER TO CARBOXYLIC MONOMER IS 1:3 TO 3:1, THE SAID MEMBRANE HAVING A CAPACITY OF BETWEEN ABOUT 4 TO 11 MEG. DRY GM. OF POLYMERIZED PRODUCT, AND BEING SUBSTANTIALLY DIMENSIONALLY STABLE AND
Claim 2
Dependent Claim
162 words
A SOLID BIFUNCTIONAL CATION SELECTIVE MEMBRANE HAVING AT LEAST TWO DIMENSIONS IN EXCESS OF ONE CM. COMPRISING A CROSSLINKED POLYMER MATRIX BONDED TO BOTH CARBOXYLIC ACID AND SULFONIC ACID FUNCTIONAL GROUPS, SAID MATRIX BEING A POLYMERIZED PRODUCT OF A SOLUTION MIXTURE OF AT LEAST ONE MONVINYL AROMATIC MONOMER, AT LEAST ONE POLYVINYL AROMATIC MONOMER, AT LEAST ONE OLEFINIC CARBOXYLIC MONOMER AND A NONPOLYMERIZABLE ORGANIC HYDROCARBON SOLVENT, SAID MIXTURE CONTAINING SAID POLYVINYL MONOMER BETWEEN 40-50 MOLE % OF THE TOTAL POLYMERIZABLE MONOMERS AND BETWEEN 20-50% BY VOLUME OF SAID NON-POLYMERIZABLE SOLVENT, THE SAID SULFONIC ACID GROUPS BEING CHEMICALLY BOUNDED TO THE VINYL AROMATIC NUCLEI OF SAID POLYMER MATRIX IN AN AMOUNT AVERAGING 0.65 TO 1.2 GROUPS FOR EVERY CARBOXYLIC ACID GROUP CONTAINING THEREIN AND THEREIN THE MOLE RATIO OF THE MONOVINYL MONOMER TO CARBOXYLIC MONOMER IS 1:3 TO 3:1, THE SAID MEMBRANE HAVING A CAPACITY OF BETWEEN ABOUT 4 TO 11 MEG. DRY GM. OF POLYMERIZED PRODUCT, AND BEING SUBSTANTIALLY DIMENSIONALLY STABLE AND
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |