US3541030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making inorganic ion exchange membranes
Assignee: National Aeronautics and Space Administration
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Filing: 1966-12-08
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Granted: 1970-11-17
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Expires: 1986-12-08
Abstract
No abstract record available.
Inventors
- 👤 David B Boies
- 👤 Paul K Ase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:43
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |