US3633337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-handling method and apparatus
Assignee: Research Cottrell Inc
•
Filing: 1969-04-25
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Granted: 1972-01-11
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Expires: 1989-04-25
Abstract
Abstract A method and apparatus for preventing deposition, on oppositely charged or grounded surfaces of heat exchangers, catalyst beds and the like, of gas stream carried charged particles issuing from electrostatic precipitators by neutralizing the effect of the charge on the particles downstream of the electrical precipitator particle collecting zone.
Inventors
- 👤 Alan B Walker
- 👤 Herbert J Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:37
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/019; Y; Y10; Y10S; Y10S422/00; Y10S422/907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
The method defined in claim 1 wherein neutralization of the effect of the charge on the remaining suspended particles is also effected by maintaining a repelling charge on surfaces generally perpendicular to the gas flow downstream of the collecting zone.
Claim 2
Independent Claim
74 words
A method of deionizing particulate matter suspended in a gas stream after the substantial portion of the suspended matter has been removed by electrical precipitation; comprising creating an electricAl zone of both positive and negative ions substantially entirely across the gas stream by applying high-voltage alternating current in a plurality of spaced-apart paths to form substantially continuous corona across the gas stream containing the charged suspended particulate matter of both positive and negative polarities.
Claim 3
Dependent Claim
50 words
The method as defined in claim 3 further including the step of collecting charged suspended particulate matter of one of the polarities by attracting said suspended particulate matter of said one polarity to a grounded surface located within and substantially across the gas stream upstream of the said electrical zone.
Claim 4
Dependent Claim
130 words
Apparatus for treating particulate matter suspended in a gas stream comprising a housing having a gas stream inlet and a spaced gas stream outlet; an electrostatic precipitator including discharge and collecting electrodes in said housing down stream of the gas stream inlet for removing a substantial portion of the suspended particulate matter from the gas stream; means for deionizing charged particulate matter not removed by the electrostatic precipitator; said deionizing means including a plurality of spaced conductors positioned across the housing transverse to the direction of gas flow and downstream of the electrostatic precipitator; and means for applying a high-voltage unrectified alternating current to each of the spaced conductors at a potential to establish a substantially continuous corona across the housing to neutralize the charge on the suspended particulate matter.
Claim 5
Dependent Claim
56 words
The apparatus defined in claim 5 further including an extended surface conductive member having a plurality of gas flow passages therethrough, and means mounting said member across the housing between the electrostatic precipitator and the said plurality of spaced conductors, said mounting means including an electrically conductive path between the extended conductive member and the housing.
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |