US3900766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge apparatus for particle collection
Assignee: Denki Onkyo Co Ltd
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Filing: 1973-11-02
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Granted: 1975-08-19
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Expires: 1993-11-02
Abstract
Abstract In corona discharge apparatus of the class including a source of high voltage and a corona discharge device energized therefrom, the source of high voltage is comprised by a source of alternating current and a piezoelectric transformer including a piezoelectric body, a pair of driving electrodes applied on the opposite surfaces of one end of the piezoelectric body and connected across the source of alternating current and an output electrode mounted on the other end of the piezoelectric body and connected to the corona discharge device and an electrostatic particle collector.
Inventors
- 👤 Takehiko Kawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:18
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; G; G03; G03G; G03G15/00; G03G15/02; G03G15/0283
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
An electrostatic precipitator comprising: a source of alternating low voltage with one grounded terminal; a high voltage ceramic piezoelectric transformer having input terminals connected across said low voltage and a high voltage, high impedance output terminal with no DC connection to ground; rectifier means coupled to said output terminal including voltage multiplier means for producing relative to ground a high direct output voltage and an intermediate direct potential; an atmospheric ionizing device having spaced electrodes one of which is grounded connected across said high direct output voltage and Operative to electrostatically charge particles suspended in the medium between said electrodes; and a particle collector having spaced electrodes one of which is grounded connected across said high direct output voltage and a third electrode positioned between said spaced electrodes and connected to be maintained at said intermediate direct potential; the grounded electrodes of said device and said collector being directly connected to said grounded terminal.
Claim 2
Dependent Claim
154 words
An electrostatic precipitator comprising: a source of alternating low voltage with one grounded terminal; a high voltage ceramic piezoelectric transformer having input terminals connected across said low voltage and a high voltage, high impedance output terminal with no DC connection to ground; rectifier means coupled to said output terminal including voltage multiplier means for producing relative to ground a high direct output voltage and an intermediate direct potential; an atmospheric ionizing device having spaced electrodes one of which is grounded connected across said high direct output voltage and Operative to electrostatically charge particles suspended in the medium between said electrodes; and a particle collector having spaced electrodes one of which is grounded connected across said high direct output voltage and a third electrode positioned between said spaced electrodes and connected to be maintained at said intermediate direct potential; the grounded electrodes of said device and said collector being directly connected to said grounded terminal.
Claim 3
Dependent Claim
63 words
The electrostatic precipitator according to claim 1 wherein said particle collector comprises three spaced apart parallel electrodes, the outer electrodes of said parallel electrodes being connected across said high direct output voltage, a capacitor type voltage divider connected across said high direct output voltage, and the intermediate electrode of said parallel electrodes connected to an intermediate point of said capacitor type voltage divider.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |