US3821644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatic counting and measurement of suspended particles
Assignee: Individual
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Filing: 1973-03-19
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Granted: 1974-06-28
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Expires: 1993-03-19
Abstract
Abstract A particle detecting apparatus includes a gap defined between two electrodes at least one of which constitutes three plates of electrically conductive material separated from each other by electrically nonconductive material, the two electrodes being supported in an electrically nonconductive mounting. The opening thus formed is of capillary dimensions. The electrodes are connected to circuit means which impose a potential between the electrodes, subjecting the intervening space to an electric field. The dielectric characteristics in the gap are altered as a dispersion of particles is passed therethrough, the dielectric changes being detected by the circuits connected to the electrodes. In one embodiment, capacitors connect the outer two electrodes to ground and the center electrode to a measuring device. In another embodiment, each side has three electrodes and the center electrodes constitute the frequency determining elements of an oscillator. In each case the three plates forming the electrode have substantially flat, parallel faces perpendicular to the direction of flow of the particle suspension.
Inventors
- 👤 H Gohde
- 👤 W Godhe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:02
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1031; G01N15/12; G01N15/13
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
175 words
A device for counting and measuring suspended particles in a flowing fluid suspension comprising a first electrode including first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode; electrically nonconductive means forming walls extending between said faces to define a capillary flow passage through which a fluid particle suspension can be passed; means for generating a unidirectional electric field between said faces, said means comprising a voltage source; and means for connecting one side of said voltage source to said first electrode and the other side of said source to said second electrode; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; and capacitive circuit means for connecting said second plate to said measuring circuit means.
Claim 2
Independent Claim
175 words
A device for counting and measuring suspended particles in a flowing fluid suspension comprising a first electrode including first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode; electrically nonconductive means forming walls extending between said faces to define a capillary flow passage through which a fluid particle suspension can be passed; means for generating a unidirectional electric field between said faces, said means comprising a voltage source; and means for connecting one side of said voltage source to said first electrode and the other side of said source to said second electrode; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; and capacitive circuit means for connecting said second plate to said measuring circuit means.
Claim 3
Dependent Claim
28 words
A device according to claim 1 wherein the dimension of said second plate is significantly shorter than said first and third plates in the direction of suspension flow.
Claim 4
Dependent Claim
29 words
A device according to claim 2 and further comprising first and second chambers for containing the suspension, said passage constituting a flow connection between said first and second chambers.
Claim 5
Independent Claim
220 words
A device for counting and measuring suspended particles in a flowing suspension comprising a first electrode including first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates, the dimension of said second plate being significantly shorter than said first and third plates in the direction of suspension flow; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode; electrically nonconductive means extending between said faces to define a capillary flow passage through which a particle suspension can be passed; first and second chambers for containing the suspension, said passage constituting a flow connection between said chambers; means for generating an electric field between said faces, said means comprising a voltage source; and means for connecting one side of said voltage source to said first electrode and the other side of said source to said second electrode; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; capacitive circuit means for connecting said second plate to said measuring circuit means; and means for determining the volume of suspension being delivered through said passage.
Claim 6
Independent Claim
220 words
A device for counting and measuring suspended particles in a flowing suspension comprising a first electrode including first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates, the dimension of said second plate being significantly shorter than said first and third plates in the direction of suspension flow; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode; electrically nonconductive means extending between said faces to define a capillary flow passage through which a particle suspension can be passed; first and second chambers for containing the suspension, said passage constituting a flow connection between said chambers; means for generating an electric field between said faces, said means comprising a voltage source; and means for connecting one side of said voltage source to said first electrode and the other side of said source to said second electrode; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; capacitive circuit means for connecting said second plate to said measuring circuit means; and means for determining the volume of suspension being delivered through said passage.
Claim 7
Independent Claim
195 words
A device for counting and measuring suspended particles comprising a first electrode including, first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode; electrically nonconductive means extending between said faces to define a capillary flow passage through which a particle suspension can be passed; means for generating an electric field between said faces, said means comprising a voltage source including a direct voltage source and a load resistor; and means for connecting one side of said voltage source to said first electrode and the other side of said source to said electrode, said means for connecting including first, second and third diodes for connecting said source to the plates of said first electrode; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; and capacitive circuit means for connecting said second plate to said measuring circuit means.
Claim 8
Independent Claim
195 words
A device for counting and measuring suspended particles comprising a first electrode including, first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode; electrically nonconductive means extending between said faces to define a capillary flow passage through which a particle suspension can be passed; means for generating an electric field between said faces, said means comprising a voltage source including a direct voltage source and a load resistor; and means for connecting one side of said voltage source to said first electrode and the other side of said source to said electrode, said means for connecting including first, second and third diodes for connecting said source to the plates of said first electrode; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; and capacitive circuit means for connecting said second plate to said measuring circuit means.
Claim 9
Independent Claim
184 words
A device for counting and measuring suspended particles comprising a first electrode including first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode, said second electrode comprising fourth, fifth and sixth mutually insulated plates; electrically nonconductive means extending between said faces to define a capillary flow passage through which a particle suspension can be passed; means for generating an electric field between said faces, said means comprisinG a voltage source including an oscillator; and means for connecting one side of said oscillator to said fifth plate of said second electrode, said second and fifth plates thereby constituting a frequency determining element thereof; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; and capacitive circuit means for connecting said second plate to said measuring circuit means.
Claim 10
Independent Claim
184 words
A device for counting and measuring suspended particles comprising a first electrode including first, second and third plates of electrically conductive material mounted in substantially adjacent relationship, said first electrode having an exposed face including parts of the three plates; insulating means for electrically isolating said plates from each other; a second electrode having an exposed face spaced from said exposed face of said first electrode, said second electrode comprising fourth, fifth and sixth mutually insulated plates; electrically nonconductive means extending between said faces to define a capillary flow passage through which a particle suspension can be passed; means for generating an electric field between said faces, said means comprisinG a voltage source including an oscillator; and means for connecting one side of said oscillator to said fifth plate of said second electrode, said second and fifth plates thereby constituting a frequency determining element thereof; measuring circuit means for accepting input signals from said first electrode and producing an output signal representative of characteristics of the particles in the suspension; and capacitive circuit means for connecting said second plate to said measuring circuit means.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |