US3907520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic precipitating method
Assignee: Individual
•
Filing: 1973-10-11
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Granted: 1975-09-23
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Expires: 1993-10-11
Abstract
Abstract An electrostatic precipitating method which includes moving a gas stream with charged particles entrained therein along a prescribed path and imposing an electrostatic force field on the charged particles with a first component of force exerted on the particles opposite to the direction of movement of the particles to slow the particles down and a second component of force exerted on the particles generally normal to the path of movement of the particles to separate the particles from the gas stream.
Inventors
- 👤 A Ben Huang
- 👤 Arnold L Ducoffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/12; B03C3/34; B03C3/74; B03C3/743; Y; Y10; Y10S; Y10S55/00; Y10S55/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A METHOD OF SEPARATING CHARGED PARTICLES FROM A GAS STREAM INCLUDING THE STEPS OF: MOVING THE GAS STREAM WITH THE CHARGED PRTICLES ENTRAINED THEREIN ALONG A PRESCRIBED PATH THROUGH A TUBULAR DUCT POSITIONING A FIRST OPEN GRID WITHIN THE TUBULAR DUCT SO THAT THE FIRST GRID EXTENDS GENERALLY TRANSVERSELY ACROSS THE PRESCRIBED PATH, POSITIONING A SECOND OPEN GRID WITHIN THE TUBULAR DUCT A PRESCRIBED DISTANCE DOWNSTREAM OF THE FIRST GRID SO THAT THE SECOND GRID EXTENDS GENERALLY TRANSVERSELY ACROSS THE PRESCRIBED PATH, ELECTRICALLY GROUNDING THE FIRST AND THAT PORTION OF THE DUCT WALL BETWEEN THE FIRST AND SECOND GRIDS, IMPOSING AN ELECTRICAL POTENTIAL OF A PRESCRIBED VALUE ON THE SECOND GRID WITH THE SAME POLARITY AS THAT ON THE PARTICLES
Claim 2
Independent Claim
120 words
A METHOD OF SEPARATING CHARGED PARTICLES FROM A GAS STREAM INCLUDING THE STEPS OF: MOVING THE GAS STREAM WITH THE CHARGED PRTICLES ENTRAINED THEREIN ALONG A PRESCRIBED PATH THROUGH A TUBULAR DUCT POSITIONING A FIRST OPEN GRID WITHIN THE TUBULAR DUCT SO THAT THE FIRST GRID EXTENDS GENERALLY TRANSVERSELY ACROSS THE PRESCRIBED PATH, POSITIONING A SECOND OPEN GRID WITHIN THE TUBULAR DUCT A PRESCRIBED DISTANCE DOWNSTREAM OF THE FIRST GRID SO THAT THE SECOND GRID EXTENDS GENERALLY TRANSVERSELY ACROSS THE PRESCRIBED PATH, ELECTRICALLY GROUNDING THE FIRST AND THAT PORTION OF THE DUCT WALL BETWEEN THE FIRST AND SECOND GRIDS, IMPOSING AN ELECTRICAL POTENTIAL OF A PRESCRIBED VALUE ON THE SECOND GRID WITH THE SAME POLARITY AS THAT ON THE PARTICLES
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the step of preventing the collection of the charged particles on the upstream side of the grounded first grid includes electrically shielding the upstream side of the first grid.
Claim 4
Dependent Claim
72 words
The method of claim 2 wherein the step of preventing the collection of charged particles on the upstream side of the grounded first grid further includes directing a secondary stream of a gaseous medium without charged particles therein around the peripheral edges of the first grid to cause the gas stream with the charged particles therein to bypass the grounded first grid without the charged particles being collected on the first grid.
Claim 5
Independent Claim
273 words
A method of separating charged particles from a gas stream including the steps of: moving the gas stream with the charged particles entrained therein along a prescribed path within a tubular duct; positioning a plurality of first open grids so as to intersect said prescribed path spaced from each other by a prescribed distance; imposing an electrical potential of a prescribed value on said most upstream first open grid with the same polarity as that of the charge on said particles; imposing an electrical potential on the remaining first grids of the same polarity as the charge on said particles, the charge on each of said remaining first grids having a value a predetermined amount greater than the charge on the next adjacent upstream first grid; positioning an additional second open grid so as to intersect said prescribed path and spaced upstream from said most upstream first open grid, electrically grounding said additional second open grid and said tubular duct between adjacent open grids; and, electrically shielding the upstream side of said second open grid to prevent the collection of the charged particles thereon so that an electrostatic repulsive force field is generated between adjacent grids and the duct wall therebetween which exerts a first component of force on the particles as they pass between adjacent grids opposite to the direction of movement of the gas stream along the prescribed path and exerts a second component of force on the particles generally toward the duct wall and normal to the prescribed path to slow the movement of the particles with the gas stream and deflect the particles to the duct wall for collection.
Claim 6
Independent Claim
273 words
A method of separating charged particles from a gas stream including the steps of: moving the gas stream with the charged particles entrained therein along a prescribed path within a tubular duct; positioning a plurality of first open grids so as to intersect said prescribed path spaced from each other by a prescribed distance; imposing an electrical potential of a prescribed value on said most upstream first open grid with the same polarity as that of the charge on said particles; imposing an electrical potential on the remaining first grids of the same polarity as the charge on said particles, the charge on each of said remaining first grids having a value a predetermined amount greater than the charge on the next adjacent upstream first grid; positioning an additional second open grid so as to intersect said prescribed path and spaced upstream from said most upstream first open grid, electrically grounding said additional second open grid and said tubular duct between adjacent open grids; and, electrically shielding the upstream side of said second open grid to prevent the collection of the charged particles thereon so that an electrostatic repulsive force field is generated between adjacent grids and the duct wall therebetween which exerts a first component of force on the particles as they pass between adjacent grids opposite to the direction of movement of the gas stream along the prescribed path and exerts a second component of force on the particles generally toward the duct wall and normal to the prescribed path to slow the movement of the particles with the gas stream and deflect the particles to the duct wall for collection.
Claim 7
Dependent Claim
60 words
The method of claim 4 further including the step of directing a flow of a gaseous medium without charged particles therein about the peripheral surfaces of said second open grid and generally parallel to the prescribed path to cause the gas stream with the charged particles entrained therein to pass by the second open grid without particles being collected thereon.
Claim 8
Dependent Claim
38 words
The method of claim 5 further including the step of imposing a charge on the particles entrained in the gas stream upstream of said second open grid of the same polarity as the charge on said first grids.
Claim 9
Dependent Claim
51 words
The method of claim 6 further including the step of injecting a conveRting medium into the gas stream upstream of the point at which the electrical charge is imposed on the particles therein to convert gaseous pollutants in the gas stream into particulate matter for acceptance of an electrical charge thereon.
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |