Patent US3468778A successfully refreshed from Google Patents.
US3468778A
Expired / Lapsed
US
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Electrostatic liquid filter
Assignee: HYDROMATION ENG CO
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Filing: 1966-01-14
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Granted: 1969-09-23
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Expires: 1986-01-14
Abstract
No abstract record available.
Inventors
- 👤 Gene Hirs
- 👤 Kenneth W Mackenzie
- 👤 Alfred H Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:56
CPC Classifications
B; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/026
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) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |