US3491022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrasonic activation of desalination membranes
Assignee: Individual
•
Filing: 1967-12-27
•
Granted: 1970-01-20
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Expires: 1987-12-27
Abstract
No abstract record available.
Inventors
- 👤 Walter Huff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:30
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/34; C02F1/36; B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; B01D65/00; B01D65/08; B01D2321/00; B01D2321/20; B01D2321/2066; B01D2321/2075; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131
Claims Analysis
Total Claims: 0
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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) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |