Patent US2665770A successfully refreshed from Google Patents.
US2665770A
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US
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Electrostatic precipitator
Assignee: Westinghouse Electric Corp
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Filing: 1951-10-30
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Granted: 1954-01-12
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Expires: 1971-10-30
Abstract
No abstract record available.
Inventors
- 👤 Earl L Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:47
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2008246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |