US3733784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-bag dust collector
Assignee: Alstom Power Inc
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Filing: 1971-10-05
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Granted: 1973-05-22
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Expires: 1991-10-05
Abstract
Abstract A filter arrangement that first imposes an electrostatic charge upon all particulate matter carried by a stream of gas to be filtered. A charge of similar polarity is placed upon the filtering means whereby the particulate matter having a like charge is repelled therefrom to permit only the dust-free carrier gas to pass therethrough.
Inventors
- 👤 W Anderson
- 👤 J Dervay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:37
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
Filter apparatus that comprises a filter housing enclosing a filter compartment having an inlet for gas to be filtered and an outlet for the exhaust of clean gas therefrom, a perforated tube sheet intermediate the inlet and outlet, insulating means surrounding each perforation of said tube sheet, a metallic cage for a bag filter depending from each insulating means, a filter element surrounding each metallic cage, means for imposing an electric field on each cage and its surrounding filter, a discharge electrode in advance of said inlet for subjecting particulate matter carried by the gas to be filtered to an electrostatic charge having a polarity similar to that placed upon each cage and its surrounding filter, and means comprising a ground connection secured to said filter housing whereby particulate matter carried in said gas stream is first charged by the electrostatic discharge from said electrode and then repelled by the similarly charged filter before being deposited in the housing.
Claim 2
Dependent Claim
159 words
Filter apparatus that comprises a filter housing enclosing a filter compartment having an inlet for gas to be filtered and an outlet for the exhaust of clean gas therefrom, a perforated tube sheet intermediate the inlet and outlet, insulating means surrounding each perforation of said tube sheet, a metallic cage for a bag filter depending from each insulating means, a filter element surrounding each metallic cage, means for imposing an electric field on each cage and its surrounding filter, a discharge electrode in advance of said inlet for subjecting particulate matter carried by the gas to be filtered to an electrostatic charge having a polarity similar to that placed upon each cage and its surrounding filter, and means comprising a ground connection secured to said filter housing whereby particulate matter carried in said gas stream is first charged by the electrostatic discharge from said electrode and then repelled by the similarly charged filter before being deposited in the housing.
Claim 3
Dependent Claim
26 words
A filter apparatus as defined in claim 1 having an auxiliary cleaning mechanism that removes particulate matter that collects on the surface of the filter element.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |