US3542908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a reverse osmosis memberane
Assignee: United States Department of the Interior
•
Filing: 1968-03-22
•
Granted: 1970-11-24
•
Expires: 1988-03-22
Abstract
No abstract record available.
Inventors
- 👤 Allan Sharples
- 👤 George Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:24
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/40; B01D71/401; B01D71/4011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3103508A
Cited
US2604668A
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US2680735A
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US3275582A
Cited
US3418406A
Cited
US3331772A
Cited
US3332894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |