US3346422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making inorganic permselective membranes
Assignee: Douglas Aircraft Co Inc
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Filing: 1963-11-29
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Granted: 1967-10-10
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Expires: 1983-11-29
Abstract
No abstract record available.
Inventors
- 👤 Berger Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/431; H01M50/434; C08J2325/00; C08J2325/18; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD OF FORMING A PERMSELECTIVE MEMBRANE FROM A PERMSELECTIVE MEMBRANE INCORPORATING AS INORGANIC ION EXCHANGE MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN INSOLUBLE HYDROUS METAL OXIDE AND AN ACID SALT THEREOF, COMPRISING THE STEP OF, PASSING AN AQUEOUS SOLUTION THROUGH SAID MEMBRANE, SAID SOLUTION CONTAINING A REAGENT SELECTED FROM THE GROUP CONSISTING OF AN ACID, A BASE, AND A SALT, SAID REAGENT BEING REACTIVE WITH SAID ION EXCHANGE MATERIAL TO CAUSE SAID INORGANIC MATERIAL TO BE AT LEAST PARTIALLY CONVERTED TO AN INORGANIC MATERIAL HAVING DIFFERENT ION EXCHANGE CHARACTERISTICS.
Claim 2
Independent Claim
91 words
A METHOD OF FORMING A PERMSELECTIVE MEMBRANE FROM A PERMSELECTIVE MEMBRANE INCORPORATING AS INORGANIC ION EXCHANGE MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN INSOLUBLE HYDROUS METAL OXIDE AND AN ACID SALT THEREOF, COMPRISING THE STEP OF, PASSING AN AQUEOUS SOLUTION THROUGH SAID MEMBRANE, SAID SOLUTION CONTAINING A REAGENT SELECTED FROM THE GROUP CONSISTING OF AN ACID, A BASE, AND A SALT, SAID REAGENT BEING REACTIVE WITH SAID ION EXCHANGE MATERIAL TO CAUSE SAID INORGANIC MATERIAL TO BE AT LEAST PARTIALLY CONVERTED TO AN INORGANIC MATERIAL HAVING DIFFERENT ION EXCHANGE CHARACTERISTICS.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |