US3552574A
Expired / Lapsed
US
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Reverse osmosis system
Assignee: United States Department of Agriculture
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Filing: 1969-06-30
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Granted: 1971-01-05
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Expires: 1989-06-30
Abstract
Abstract Reverse osmosis system provided with means for promoting turbulence and for scouring the membrane surface whereby to prevent concentration polarization and skinning (false membrane formation). These valuable results are attained by periodic movement of a plurality of free spheres in the interface zone, at or near the membrane surface.
Inventors
- 👤 Edison Lowe
- 👤 Everett L Durkee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:11
CPC Classifications
A; A23; A23C; A23C9/00; A23C9/14; A23C9/142; A23C9/1427; B; B01; B01D; B01D61/00; B01D61/02; B01D61/08; B01D63/00; B01D63/08; B01D65/00; B01D65/08; B01D65/02; B01D65/04
Claims Analysis
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |