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Patent US2640559A successfully refreshed from Google Patents.
US2640559A
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Electrical precipitator circuits
Assignee: Westinghouse Electric Corp
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Filing: 1946-01-21
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Granted: 1953-06-02
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Expires: 1966-01-21
Abstract
No abstract record available.
Inventors
- 👤 Elmer G Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:29
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE456405C
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DE649446C
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US2297933A
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US2336625A
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US2326237A
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US2462890A
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US2598337A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |