Patent US5900043A successfully refreshed from Google Patents.
US5900043A
Expired / Lapsed
US
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Electrostatic filter with process for fast cleaning without breaking confinement
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1997-04-29
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Granted: 1999-05-04
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Expires: 2017-04-29
Abstract
Abstract Electrostatic filter in which the enclosure (2) is fitted with a flexible membrane (12) , behind which an acoustic wave generator (14) is placed and which vibrates the gaseous contents of the filter to detach retained dust and clean the filter.
Inventors
- 👤 Jean-Paul Grandjean
- 👤 Jean-Raymond Bernard
- 👤 Guy Pilot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0027; B01D46/0032; B03; B03C; B03C3/00; B03C3/34; B03C3/74; B01D46/0084; B01D46/0097; B01D46/42; B01D46/4245; B01D46/66; B01D46/74; B01D46/76; B01D71/00; B01D71/02; B01D71/022; B01D71/06; B01D2259/00; B01D2259/80; B01D2259/816
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
Process for cleaning an electrostatic filter comprising an enclosure, a filter in the enclosure, a sound wave generator, and a flexible membrane of the enclosure separated from the filter and separating the sound wave generator from the filter, wherein the membrane has a frequency of coincidence at which the membrane transmits acoustic waves, and the generator produces sounds having a frequency almost coincident to said frequency of coincidence, characterized in that the sound wave generator is put into operation while the gas is kept in circulation through a bypass.
Claim 2
Dependent Claim
89 words
Process for cleaning an electrostatic filter comprising an enclosure, a filter in the enclosure, a sound wave generator, and a flexible membrane of the enclosure separated from the filter and separating the sound wave generator from the filter, wherein the membrane has a frequency of coincidence at which the membrane transmits acoustic waves, and the generator produces sounds having a frequency almost coincident to said frequency of coincidence, characterized in that the sound wave generator is put into operation while the gas is kept in circulation through a bypass.
Claim 3
Dependent Claim
38 words
Cleaning process according to claim 1, characterized in that the gas is bypassed around the electrostatic filter while the said filter is being cleaned and is directed directly to a second filter (24) downstream from the electrostatic filter.
Claim 4
Dependent Claim
36 words
Cleaning process according to claim 1, characterized in that cleaning takes place as soon as a voltage maintained between the conducting elements (3) of filter (1) by a voltage generator (19) passes below a given threshold.
Claim 5
Dependent Claim
17 words
Cleaning process according to claim 1, characterized in that it is done without breaking the filter confinement.
Claim 6
Dependent Claim
66 words
An electrostatic filter assembly comprising an enclosure, a filter in the enclosure, a sound wave generator, and a flexible membrane of the enclosure separated from the filter and separating the sound wave generator from the filter, wherein the membrane has a frequency of coincidence at which the membrane transmits acoustic waves, and the generator produces sounds having a frequency almost coincident to said frequency of coincidence.
Claim 7
Dependent Claim
66 words
An electrostatic filter assembly comprising an enclosure, a filter in the enclosure, a sound wave generator, and a flexible membrane of the enclosure separated from the filter and separating the sound wave generator from the filter, wherein the membrane has a frequency of coincidence at which the membrane transmits acoustic waves, and the generator produces sounds having a frequency almost coincident to said frequency of coincidence.
Claim 8
Dependent Claim
70 words
Filter according to claim 5, characterized in that the membrane (12) is located at the top (13) of the enclosure, a bin (10) is located under the filter (1) and there is a passageway into the filter through a collection duct (9), and gas inlet (4) and outlet (5) ducts for the gas to be filtered lead into the filter through two opposite parts (6, 7) of the enclosure (2).
Claim 9
Dependent Claim
23 words
Filters according to claim 5, characterized in that the sound waves consist of pulses lasting for at least a tenth of a second.
Claim 10
Dependent Claim
18 words
Filter according to claim 5, characterized in that the membrane is composed of a plastic or metal material.
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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) | 2002-05-03 | 2002-11-02 | 2003-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-03 | 2006-11-02 | 2007-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-03 | 2010-11-02 | 2011-05-04 | $7700.00 | Window Closed / Lapsed |