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Patent US3740925A successfully refreshed from Google Patents.
US3740925A
Expired / Lapsed
US
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Methods of and apparatus for separating solid and liquid particles from air and other gases
Assignee: Filteron International Inc
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Filing: 1971-07-06
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Granted: 1973-06-26
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Expires: 1991-07-06
Abstract
Abstract Processes and systems for separating solid and/or liquid particles from air or other gases in which the gas is caused to move with the particles dispersed in it to the highest intensity region of a non-uniform electrical field where the particles are collected.
Inventors
- 👤 N Gothard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:03
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/38; Y; Y10; Y10S; Y10S55/00; Y10S55/30; Y10S55/38
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
329 words
A method of separating particles of solid and liquid substances from air and other gases, which comprises the steps of: a. establishing a non-uniform electrical field between first and second electrically isolated electrode means by impressing across said electrode means a voltage which is such that the maximum value of the non-uniform electrical field is below the breakdown strength of the gas from which particles are to be separated; b. effecting a flow of the gas in which the particles to be separated are dispersed through a passage between said first and second electrode means to thereby cause said gas and the particles to be separated therefrom to traverse and interact with the non-uniform electrical field, whereby the force created by said field will move said particles to the region of the non-uniform field in which the field intensity is highest; c. polarizing the gas in which the particles to be separated are dispersed so that said gas will move with said particles to the region of the field in which the field intensity is the highest to thereby reduce the drag forces on the particles attributable to the motion of the particles in the gas and increase the efficiency of the separation process, said gas being polarized by creating a current between said electrode means such that the maximum current density in the non-uniform field is in the range of 10 12 to 10 6 amperes per square centimeter to thereby impart a charge to certain of the molecules of the gas in which the particles are dispersed without charging the particles to the extent that the particles can move by electrophoresis, thereby producing an ensemble of charged and uncharged gas particles on which the force created by the non-uniform field can act to effect the aforesaid movement of the gas; and d. collecting in the region of the field in which the field intensity is the highest particles moving thereto under the influence of the non-uniform field.
Claim 2
Dependent Claim
77 words
The method of claim 2, wherein the electrode means have curved surface portions and wherein the voltage impressed across the electrode means is maintained at a level where grad E 2 < or = 4 E2 max (1/a), where grad E2 is the gradient of the field squared, Emax is the breakdown field strength of the gas in which the particles are dispersed, and 1/a is the maximum curvature of any equipotential line in the non-uniform field.
Claim 3
Dependent Claim
83 words
The method of claim 2, wherein at least one of the electrode means has a flat surface portion and wherein the voltage impressed across the electrode means is maintained at a level where grad E 2 < or = 2 E2 max (1/a), where grad E 2 is the gradient of the field squared, Emax is the breakdown field strength of the gas in which the particles are dispersed, and 1/a is the maximum curvature of any field line in the non-uniform field.
Claim 4
Independent Claim
313 words
A method of separating particles of solid and liquid substances from air and other gases, which comprises the steps of: a. establishing a non-uniform electrical field between first and second electrically isolated electrode means by impressing across said electrode means a voltage which is such that the maximum value of the non-uniform electrical field is below the breakdown strength of the gas from which particles are to be separated; b. effecting a flow of the gas in which the particles to be separated are dispersed through a passage between said first and second electrode means to thereby cause said gas and the particles to be separated there from to traverse and interact with the non-uniform electrical field, whereby the force created by said field will move said particles to the region of the non-uniform field in which the field intensity is highest; c. polarizing the gas in which the particles to be separated are dispersed without charging the particles to the point where they will move by electrophoresis so that said gas will move with said particles to the region of the field in which the particles are to be collected to thereby reduce to a minimum the drag forces on the particles attributable to the movement of the particles in the gas and increase the efficiency of the separation process, said gas being polarized by maintaining the current density in the non-uniform field at a sufficiently high level that the charged and uncharged gas molecules will form ensembles having a size of at least 10 molecular diameters; d. collecting in the region of the field in which the field intensity is the highest particles moving thereto with the gas in which they are dispersed under the influence of the non-uniform field; and e. removing from the region of the field in which the field intensity is the highest the particles there collected.
Claim 5
Dependent Claim
35 words
The method of claim 1, wherein the particles are collected at one of said electrode means and including the step of removing from said electrode means the particles collected thereat by vibrating said electrode means.
Claim 6
Dependent Claim
40 words
The method of claim 1, wherein the particles are collected at one of said electrode means and including the step of removing from said electrode means the particles collected thereat by directing a flow of fluid against said electrode means.
Claim 7
Dependent Claim
39 words
The method of claim 1, wherein the particles are collected at one of said electrode means and including the step of removing from said electrode means the particles collected thereat by vacuuming the collected particles from the electrode means.
Claim 8
Dependent Claim
44 words
The method of claim 1, wherein the particles are collected at one of said electrode means and including the step of removing from said electrode means the particles collected thereat by moving a means having cleaning elements engageable with said electrode means relative thereto.
Claim 9
Dependent Claim
53 words
The method of claim 1 wherein the particles are collected at one of said electrode means and including the step of removing from said electrode means the particles there collected by flexing the portion of the electrode means on which said particles are separated to thereby free the collected particles from said electrode.
Claim 10
Independent Claim
349 words
A method of separating particles of solid and liquid substances from air and other gases, which comprises the steps of: a. establishing a non-uniform electrical field between first and second electrically isolated electrode means by impressing across said electrode means a voltage which is such that the maximum value of the non-uniform electrical field is below the breakdown strength of the gas from which particles are to be separated; b. effecting a flow of the gas in which the particles to be separated are dispersed through a passage between said first and second electrode means to thereby cause said gas and the particles to be separated therefrom to traverse and interact with the non-uniform electrical field, whereby the force created by said field will move said particles to the region of the non-uniform field in which the field intensity is highest; c. polarizing the gas in which the particles to be separated are dispersed so that said gas will move with said particles to the region of the field in which the field intensity is the highest to thereby reduce the drag forces on the particles attributable to the motion of the particles in the gas and increase the efficiency of the separation process, said gas being polarized by creating a current between said electrode means such that the maximum current density in the non-uniform field is in the range of 10 12 to 10 6 amperes per square centimeter to thereby impart a charge tO certain of the molecules of the gas in which the particles are dispersed without charging the particles to the extent that the particles can move by electrophoresis, thereby producing an ensemble of charged and uncharged gas particles on which the force created by the non-uniform field can act to effect the aforesaid movement of the gas; d. collecting in the region of the field in which the field intensity is the highest particles moving thereto under the influence of the non-uniform field; and e. removing from the region of the field in which the field intensity is the highest the particles there collected.
Claim 11
Dependent Claim
77 words
The method of claim 11, wherein the electrode means have curved surface portions and wherein the voltage impressed across the electrode means is maintained at a level where grad E 2 < or = 4 E2max (1/a), where grad E 2 is the gradient of the field squared, Emax is the breakdown field strength of the gas in which the particles are dispersed, and 1/a is the maximum curvature of any equipotential line in the non-uniform field.
Claim 12
Dependent Claim
82 words
The method of claim 11, wherein at least one of the electrode means has a flat surface portion and wherein the voltage impressed across the electrode means is maintained at a level where grad E 2 < or = 2 E2max (1/a), where grad E 2 is the gradient of the field squared, Emax is the breakdown field strength of the gas in which the particles are dispersed, and 1/a is the maximum curvature of any field line in the non-uniform field.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |