US3398082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filtering of impurities from liquids
Assignee: Rio Tinto Switzerland AG
•
Filing: 1966-02-07
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Granted: 1968-08-20
•
Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Lochmann Helmut
- 👤 Quenzer Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:58
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/06; B03; B03C; B03C5/00; B03C5/02; Y; Y10; Y10S; Y10S55/00; Y10S55/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US820482A
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US1507687A
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US1831075A
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US1837519A
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US2295152A
Cited
GB698900A
Cited
US3111398A
Cited
US3324026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |