US2962454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonating reagent and method of making and using the same in the preparation of cation exchange membranes
Assignee: Veolia WTS Systems USA Inc
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Filing: 1956-12-05
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Granted: 1960-11-29
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Expires: 1976-12-05
Abstract
No abstract record available.
Inventors
- 👤 Wayne A Mcrae
- 👤 Samuel S Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:14
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2268; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19; C08J2325/00; C08J2325/02; C08J2325/04; C08J2353/00; C08J2353/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
140 words
A METHOD OF MAKING SYNTHETIC ORGANIC CATION EXCHANGE MEMBRANES WHEREIN REINFORCED POLYMERIZATES ARE SULFONATED, WHICH METHOD COMPRISES CASTING POLYMERIZABLE ORGANIC COMPOUNDS AT LEAST ONE OF WHICH IS AROMATIC AND SULFONATABLE, IN A SOLVENT FOR SAID COMPOUNDS IN SHEET FORM AROUND A REINFORCING SYNTHETIC ORGANIC FABRIC MATERIAL, SAID FABRIC MATERIAL BEING A HYDROLYZABLE ORGANIC POLYMER BELONGING TO THE CLASS CONSISTING OF POLYNITRILES AND POLYESTERS, SAID COMPOUNDS CAPABLE ON POLYMERIZATION OF FORMING A CROSSLINKED INSOLUBLE, INFUSIBLE MATRIX IN GEL RELATIONSHIP WITH SAID SOLVENT, EFFECTING POLYMERIZATION UNDER CONDITIONS SUBSTANTIALLY PREVENTIVE OF ESCAPE OF SAID SOLVENT, THEREBY FORMING A REINFORCED SHEET, AND CONTACTING SAID REINFORCED SHEET WITH A SOLUTION IN THE PROPORTION OF ABOUT ONE MOL OF SULFUR TRIOXIDE AND FROM ONE TO ABOUT TWO MOLS OF BENZOIC ACID IN AN INERT CHLORINATED ALIPHATIC HYDROCARBON SOLVENT THEREFOR TO PRODUCE A SULFONATE CATION EXCHANGE MEMBRANE
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |