Patent US3425190A successfully refreshed from Google Patents.
US3425190A
Expired / Lapsed
US
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Electrostatic precipitator with electrode tensioning means
Assignee: Individual
•
Filing: 1968-03-18
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Granted: 1969-02-04
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Expires: 1988-03-18
Abstract
No abstract record available.
Inventors
- 👤 Benjamin Ragland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:08
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1252183A
Cited
US1329237A
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US1843639A
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GB437626A
Cited
GB721846A
Cited
US2654438A
Cited
US2711224A
Cited
US2708980A
Cited
US2812035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |