Patent US3236285A successfully refreshed from Google Patents.
Patent US3568404A successfully refreshed from Google Patents.
US3568404A
Expired / Lapsed
US
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Low pressure electrostatic precipitator
Assignee: Research Cottrell Inc
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Filing: 1968-05-06
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Granted: 1971-03-09
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Expires: 1988-05-06
Abstract
Abstract A METHOD OF OPERATING AN ELECTROSTATIC PRECIPITATOR TO CLEAN LOW DENSITY GAS STREAMS. THE SPARKING POTENTIAL OF THE GAS STREAM TO BE CLEANED IS DETERMINED, A CORONA QUENCHING AEROSOL IS ADDED TO INCREASE THE SPARKING POTEN- TIAL OF THE STREAM AS IT IS PHASED THROUGH A PRECIPITATOR FOR ELECTROSTATIC CLEANING.
Inventors
- 👤 Alan B Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:03
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |