Patent US5322572A successfully refreshed from Google Patents.
US3390773A
Expired / Lapsed
US
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Water purification system
Assignee: Gulf General Atomic Inc
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Filing: 1965-04-13
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Granted: 1968-07-02
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Expires: 1985-04-13
Abstract
No abstract record available.
Inventors
- 👤 Merten Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/12; B01D2313/00; B01D2313/18; B01D2313/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1653204A
Cited
US1825631A
Cited
US2741595A
Cited
US3133132A
Cited
US3171808A
Cited
US3244763A
Cited
USRE26097E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |