Patent US2672206A successfully refreshed from Google Patents.
US2672206A
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US
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Electrical precipitator
Assignee: DUALTRON Co
•
Filing: 1950-07-07
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Granted: 1954-03-16
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Expires: 1970-07-07
Abstract
No abstract record available.
Inventors
- 👤 Walter E Keist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:11
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/74; B03C3/78; Y; Y10; Y10S; Y10S55/00; Y10S55/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2130630A
Cited
US2086385A
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US2181147A
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US2181767A
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US2476248A
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US2579552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |