US3684747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing the liquid absorptive capacity of linear fluorocarbon sulfonic acid polymer
Assignee: EIDP Inc
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Filing: 1970-04-22
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Granted: 1972-08-15
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Expires: 1990-04-22
Abstract
Abstract THE LIQUID ABSORPTIVE CAPACITY OF LINEAR FLUOROCARBON SULFONIC ACID POLYMER IS INCREASED BY CONTACTING THE POLYMER WITH A LIQUID SWELLING AGENT SUCH AS ETHYLENE GLCOL AT A TEMPERATURE OF AT LEAST 110*C. THE RESULTANT POLYMER HAS INCREASED PORE VOLUME, ENABLING IT TO HAVE AN INCREASED TAKE-UP CAPACITY FOR LIQUIDS SUCH AS AQUEOUS ELECTROLYTES WHICH INCREASES THE ELECTRICAL CONDUCTIVITY OF THE POLYMER MAKING IT ESPECIALLY USEFUL FOR ION-EXCHANGE MEMBRANES IN THE ELECTROCHEMICAL CELLS. THE RESULTANT SWOLLEN POLYMER IS THERMALLY STABLE IN THE SENSE THAT AFTER DRYING AT 100*C., IT RETAINS A SUBSTANTIAL PROPORTION OF ITS IMPROVED LIQUID ABSORPTIVE CAPACITY.
Inventors
- 👤 Richard Leslie Coalson
- 👤 Walther Gustav Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08K; C08K5/00; C08K5/04; C08K5/05; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |