Patent US2951818A successfully refreshed from Google Patents.
US2951818A
Expired / Lapsed
US
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Ion exchanger membranes from polyvinylidene chloride and phenolic resin reactants
Assignee: Bayer AG
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Filing: 1956-02-14
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Granted: 1960-09-06
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Expires: 1976-02-14
Abstract
No abstract record available.
Inventors
- 👤 Haagen Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:46
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2256; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J5/2231; Y; Y10; Y10T; Y10T428/00; Y10T428/8305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PRODUCT OBTAINED BY TREATING A SCREEN OF POLYVINYLIDENE CHLORIDE THREAD AT AN ELEVATED TEMPERATURE WITH AN AQUEOUS ALKALINE SOLUTION OF PHENOL FOR ABOUT 5 HOURS, SUBSEQUENTLY POURING ON SAID TREATED SCREEN A VISCOUS PRODUCT OBTAINED BY CONDENSING PHENOXYACETIC ACID, 2,4SODIUM BENZALDEHYDE DISULPHONATE AND PARA-FORMALDEHYDE, THEN COVERING AND HEATING SAID TREATED SCREEN AND CONDENSATION PRODUCT UNTIL A REDDISH, CLEAR MEMBRANE IS OBTAINED.
Claim 2
Dependent Claim
62 words
A PRODUCT OBTAINED BY TREATING A SCREEN OF POLYVINYLIDENE CHLORIDE THREAD AT AN ELEVATED TEMPERATURE WITH AN AQUEOUS ALKALINE SOLUTION OF PHENOL FOR ABOUT 5 HOURS, SUBSEQUENTLY POURING ON SAID TREATED SCREEN A VISCOUS PRODUCT OBTAINED BY CONDENSING PHENOXYACETIC ACID, 2,4SODIUM BENZALDEHYDE DISULPHONATE AND PARA-FORMALDEHYDE, THEN COVERING AND HEATING SAID TREATED SCREEN AND CONDENSATION PRODUCT UNTIL A REDDISH, CLEAR MEMBRANE IS OBTAINED.
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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) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |