US3497394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic permselective membranes and method of making same
Assignee: McDonnell Douglas Corp
•
Filing: 1963-11-29
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Granted: 1970-02-24
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Expires: 1983-11-29
Abstract
No abstract record available.
Inventors
- 👤 Carl Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:57
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D71/00; B01D71/02; B01D71/024; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C25; C25B; C25B13/00; C25B13/04; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/431; H01M50/434; C08J2325/00; C08J2325/18; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A STRONG PERMSELECTIVE MEMBRANE, COMPRISING: A STRONG, RIGID, SUBSTANTIALLY INSOLUBLE, INERT PLATE-LIKE MATRIX HAVING INTERCONNECTING PORES BETWEEN OPPOSING SURFACES; AND A GEL OF AN INSOLUBLE HYDROUS METAL OXIDE IN SAID INTERCONNECTING PORES.
Claim 2
Dependent Claim
32 words
A STRONG PERMSELECTIVE MEMBRANE, COMPRISING: A STRONG, RIGID, SUBSTANTIALLY INSOLUBLE, INERT PLATE-LIKE MATRIX HAVING INTERCONNECTING PORES BETWEEN OPPOSING SURFACES; AND A GEL OF AN INSOLUBLE HYDROUS METAL OXIDE IN SAID INTERCONNECTING PORES.
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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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |