Patent US3207708A successfully refreshed from Google Patents.
US3207708A
Expired / Lapsed
US
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Process of making an ion exchange membrane
Assignee: General Electric Co
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Filing: 1961-02-23
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Granted: 1965-09-21
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Expires: 1981-02-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Eugene Arthur Oster
- 👤 Fickett Arnold Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:03
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2256; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/18; H01M50/443; C08J2361/00; C08J2361/04; C08J2361/06; C08J2361/08; C08J2361/10; C08J2363/00; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD OF MAKING AN IRON EXCHANGE RESIN MEMBRANE COMPRISING THE STEPS OF: MAKING A MIXTURE OF FORMALIN, PARAFORMALDEHYDE AND PARAPHENOLSULFONIC ACID SUCH THAT THE MIXTURE CONSISTS ESSENTIALLY OF 1-3 PARTS BY WEIGHT OF FORMALIN, 1 PART BY WEIGHT OF PARAFORMALDEHYDE, AND 1 MOL OF PARAPHENOLSULFONIC ACID PER 1.1-1.8 MOLS OF TOTAL FORMALDEHYDE, SAID MIXTURE BEING MADE WITHIN THE TEMPERATURE RANGE OF ABOUT 5*C. TO +15* C.; IMPREGNATING A POROUS STRUCTURE WITH THE MIXTURE; AND THEN CURING THE IMPREGNATED STRUCTURE UNDER SUFFICIENT PRESSURE TO FORM A CONTINUOUS MEMBRANE.
Claim 2
Independent Claim
88 words
A METHOD OF MAKING AN IRON EXCHANGE RESIN MEMBRANE COMPRISING THE STEPS OF: MAKING A MIXTURE OF FORMALIN, PARAFORMALDEHYDE AND PARAPHENOLSULFONIC ACID SUCH THAT THE MIXTURE CONSISTS ESSENTIALLY OF 1-3 PARTS BY WEIGHT OF FORMALIN, 1 PART BY WEIGHT OF PARAFORMALDEHYDE, AND 1 MOL OF PARAPHENOLSULFONIC ACID PER 1.1-1.8 MOLS OF TOTAL FORMALDEHYDE, SAID MIXTURE BEING MADE WITHIN THE TEMPERATURE RANGE OF ABOUT 5*C. TO +15* C.; IMPREGNATING A POROUS STRUCTURE WITH THE MIXTURE; AND THEN CURING THE IMPREGNATED STRUCTURE UNDER SUFFICIENT PRESSURE TO FORM A CONTINUOUS MEMBRANE.
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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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |