US3778678A - Apparatus for electric field curtain of contact type - Google Patents

Apparatus for electric field curtain of contact type Download PDF

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US3778678A
US3778678A US3778678DA US3778678A US 3778678 A US3778678 A US 3778678A US 3778678D A US3778678D A US 3778678DA US 3778678 A US3778678 A US 3778678A
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electrodes
particles
field
electric
duct
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S Masuda
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S Masuda
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16Arrangements for supplying liquids or other fluent material
    • B05B5/1683Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08Plant for applying liquids or other fluent materials to objects
    • B05B5/087Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B05B5/088Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes for creating electric field curtains

Abstract

A tubular duct of insulating material has three elongated electrodes spirally wound along it on its outer surface, uniformly spaced from one another. The electrodes are connected with the terminals of an alternating current source having a voltage of the order of 5-10 KV to produce a wave-like electric field within the duct by which particles are repelled from the inner duct surface and repulsively propelled in one lengthwise direction along the duct.

Description

United States Masuda f. atem [1 1 [4 Dec. 11, 1973 1 1 APPARATUS FOR ELECTRIC FIELD CURTAIN OF CONTACT TYIE [76] Inventor: Senichi Masuda,

40-l0-605,1-chome, Nishigahara, Kita-ku, Tokyo, Japan [22] Filed: Feb. 16, 1972 [21] Appl. N0.: 226,750

[52] US. Cl 317/3, 118/620, 118/621,

310/2, 417/48 [51] Int. Cl B05b 5/02 [58] Field of Search 310/14, 5, 6, 2,

310/12,13;l18/620, 621; 417/48, 49; 308/10; 318/116; 51/9; 317/3, 262 A, 262 R; 239/3, 15; 117/93.4, 93.44

[56] References Cited UNITED .STATES PATENTS 3,264,998 8/1966 Dingman 417/48 X 2,786,416 3/1957 Fenemore 310/11 3,135,207 6/1964 Brown et al. 310/2 3,325,709 6/1967 Anderson 317/262 E 2,224,505 12/1940 Unger 310/14 UX 3,122,882 3/1964 Schultz et a1. 310/5 1,985,254 12/1934 I-Iuse 310/14 X 3,440,458 4/1969 Knight 310/5 FOREIGN PATENTS OR APPLICATIONS 201,574 10/1924 Great Britain 317/3 Primary Examiner-.1. D. Miller Assistant ExaminerI-Iarry E. Moose, Jr. AttorneyIra Milton Jones [57] ABSTRACT A tubular duct of insulating material has three elongated electrodes spirally wound along it on its outer surface, uniformly spaced from one another. The electrodes are connected with the terminals of an alternating current source having a voltage of the order of 5-10 KV to produce a wave-like electric field within the duct by which particles are repelled from the inner duct surface and repulsively propelled in one lengthwise direction along the duct.

2 Claims, 1 Drawing Figure APPARATUS FOR ELECTRIC FIELD CURTAIN OF CONTACT TYPE This invention relates to apparatus for controlling the motion of powder or dust particles. The particles of powders of sulphur, plastics and carbon black, etc., are electrified by means of contact electrification and those electrified particles are made to float by an electrodynamical repulsive action due to an alternating unequal electric field and, while floating, are caused to be shifted in a desired direction.

The present inventors have heretofore devised a method of this kind of transportation in a closed space of dust particles and invented an apparatus for controlling the motion of particles without any contact by an electrodynamic action by means of an alternating unequal electric field, the particles being given beforehand electric charges by corona discharge, or the like (refer to Japanese Patent Application No. 62,935,1967).

The object of the present invention is to simplify the apparatus for electrifying dust particles.

Another object is to obtain not merely an apparatus for the utilization in transportation of dust particles, but also for application broadly to be used in electrostatic printing, electrostatic painting or collecting the materials, etc.

According to the present invention, the apparatus by which powdered or powder-like material is guidingly transported comprises a tubular duct of insulating material around the exterior of which three elongated electrodes are spirally wound, with a small, uniform spacing between adjacent electrodes, and the three electrodes are connected to the respective three terminals of a three-phase a.c. source of substantially high voltage to thus cooperate in producing an electric field within the tube or duct. As a particle contacts the surface of the duct, the electric field imparts a charge to it whereby it is repelled from the tube surface and thus levitated or caused to float in the interior of the tube; and since the field moves wave-like in one direction lengthwise of the tube, the levitated particles are propelled (or, more accurately, repelled) in said direction along the tube by the electric field.

With these observations and objectives in mind, the manner in which the invention achieves its purpose will be appreciated from the following description and the accompanying drawing, which exemplifies the invention, it being understood that changes may be made in the specific apparatus disclosed herein without departing from the essentials of the invention set forth in the appended claims.

The accompanying drawing illustrates one complete example of an embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles thereof, and in which:

There is shown a side-view of an embodiment of the present invention, a part being cut away and shown in longitudinal section.

In the FIGURE, there are shown a cylindrical insulator 1, electrodes 2, 3 and a 4, and three-phase power source 7.

In the FIGURE, there is a tubular cylinder 1 comprising an insulator of high electrical resistivity and high contact electrifying effect prepared from a material such as fluorine resin, having, for example, 20mm in inner diameter, 800mm in length and 1mm in wall thickness. There are also electrodes 2, 3 and 4 formed of three electrical wires covered with, for example, fluorine resin and wound spirally around the cylinder 1, spaced from one another at intervals of 1cm. A hopper S is made from a material such as fluorine resin and serves as a source of supply for the dust 6. There is also a three-phase alternating current power source 7 which applies an alternating voltage of the order of 5 l0 KV to the electrodes 2, 3 and 4 and forms a traveling electric field in the direction of the arrow A in the interior of the cylinder 1. This electric field travels in rotating spirally in a direction perpendicular to the electrodes and the traveling velocity in the axial direction (synchronous velocity in axial direction) V is V= fp/[l (P/21rR) where f frequency of the power source,

p pitch of electrodes (3 X electrode interval), and

2R: outer diameter of the cylinder.

The dust particles supplied into the cylinder 1 from the hopper 5 are electrified by contact electrification between each particle and the inner surface of the cylinder l, or by contact of uncharged particles with particles that have already been so charged. Particles in contact with the inner surface of the tubular cylinder are then gradually peeled off from the piled surface layer and thus made to float in air space, thus shifting in direction of progression of the electric field without any contact or repeating the collision with the inner surface of the cylinder 1, and thus are ejected from the end of the cylinder 1. In a trial by utilizing lycopodium powder of average diameter of l5/u and of average weight of 1.5/u/ug, the particles are transported at a velocity of 15 cm/sec. Moreover, by an observation in detail, it is acknowledged that the particles travel spirally in the interior of cylinder 1.

The transporting action on the particles in the abovementioned apparatus of traveling wave electric field curtain of contact type is quite equally effective in upward and downward directions and regardless of whether a part or whole of the cylinder is oblique or vertical.

The shape of the electrodes is not limited to that shown in the above embodiment. For example, a plurality of ring electrodes may well be arranged on the circumference of the cylinder and each electrode may be connected to the three-phase power source by conductors.

Further, the insulator for contact electrification is not limited to a cylindrical shape and may well be of angular cylindrical shape or a flat plate. In these latter cases the rod-like substances may be arranged in parallel as electrodes.

The apparatus of electric field curtain of contact type of the present invention works effectively to prevent sticking of dust on the walls which surround the works where production of dust is active or in case of collection of raw materials. That is, a coating of insulating material for contact electrification can be provided on the surface of walls, a plurality of rod-like electrodes can be disposed near or embedded in this coating, and three-phase alternating voltage can be applied to the electrodes to peel the sticking substances from the coating, then transfer these downward, thus letting them drop into a duct provided in the lower part.

In this case as the peeled-off sticking substances are also let fall by gravity, then an apparatus of stationary wave electric field curtain forming a stationary wave alternating unequal electric field by the application of single-phase alternating voltage on the neighboring electrode may do as well.

The material of the insulator to be utilized is not limited to fluorine resin, but inorganic or organic materials may also be used, and its shape may be tubular, tabular or clothlike, so long as it is capable of electrifying by contact the particles coming into contact with it.

The particles now possible to be dealt with are such as sulphur powder, plastics powder, carbon black, etc., despite of its electric resistance, but the particles having poor adhesive and cohesive properties are suitable.

As stated above the apparatus of electric field curtain of contact type of the present invention becomes simpler inasmuch as the electrification of particles is due to the contact with the insulator or the contacts be tween the particles themselves and so it is not limited to mere transportation of particles but has further characteristics for application for such as electrostatic printing, electrostatic painting or the collection of materials, etc.

It is to be understood that the invention is not limited to the precise embodiment described above and that minor modification may be made within the scope of the invention.

Those skilled in the art will appreciate that the invention can be embodied in forms other than as herein disclosed for purposes of illustration.

The invention is defined by the following claims:

1. Apparatus for effecting the guided transportation of material in powder-like particulate form, said apparatus comprising:

A. a tubular duct of electrical insulating material through which particles of said material can guidedly move;

B. three elongated electrodes, each arranged in a spiral along a substantial length of the duct and substantially in contact with the outer surface thereof, said electrodes being spaced from one another by substantially uniform distances axially and circumferentially with respect to the duct; and

C. means connecting each of said electrodes with a different one of the terminals of a three phase alternating current source having a voltage on the order of 5 to 10 KV so that an electric field is produced between each pair of electrodes that are axially adjacent along the duct and the several turns of the several electrodes cooperate to produce an electric field that travels lengthwise in one direction along the duct at its interior, said field producing a repulsive action upon particles of said material.

2. The apparatus of claim 1, for the guided transport of powders such as sulphur, plastics and carbon black, further characterized by:

1. said duct being of a high dielectric material and having a. an inside diameter on the order of 20 mm and b. a wall thickness on the order of 1 mm; and

2. said electrodes being spaced from one another by a distance on the order of 1 mm.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 ,778 ,6'78 Dated December 11, 1973 Invent Senichi Masuda It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 2': Last line "1mm. should read --1 cm.-

Signed and sealed this 16th day of April 197M;

(SEAL) Attest: v EDWARD TLFLETGHEE R. Attesting Officer 0. MARSHALL DANE Commissioner. of Patents UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Dated December 11, 1973 Patent No. 3 ,77 8 678 Invent Senichi Masuda It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 2 Last line 1mm. should read -1 cm.

Signed and sealed this 16th day of April 197M.

(SEAL) Attest:

EDWARD I'LFLETCHERJR. '0; MARSHALL DANN Attesting Officer Commissioner of Patents USCOMM-DC 60376-P69 i 0.5. GOVERNMENT PRINTING OFFICE ISIS 0-86-384.

95 po-poso 10-69)

Claims (3)

1. Apparatus for effecting the guided transportation of material in powder-like particulate form, said apparatus comprising: A. a tubular duct of electrical insulating material through which particles of said material can guidedly move; B. three elongated electrodes, each arranged in a spiral along a substantial length of the duct and substantially in contact with the outer surface thereof, said electrodes being spaced from one another by substantially uniform distances axially and circumferentially with respect to the duct; and C. means connecting each of said electrodes with a different one of the terminals of a three phase alternating current source having a voltage on the order of 5 to 10 KV so that an electric field is produced between each pair of electrodes that are axially adjacent along the duct and the several turns of the several electrodes cooperate to produce an electric field that travels lengthwise in one direction along the duct at its interior, said field producing a repulsive action upon particles of said material.
2. The apparatus of claim 1, for the guided transport of powders such as sulphur, plastics and carbon black, further characterized by:
2. said electrodes being spaced from one another by a distance on the order of 1 mm.
US3778678A 1972-02-16 1972-02-16 Apparatus for electric field curtain of contact type Expired - Lifetime US3778678A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872361A (en) * 1973-06-04 1975-03-18 Senichi Masuda Electrodynamic apparatus for controlling flow of particulate material
DE2534776A1 (en) * 1974-08-04 1976-02-12 Masuda Senichi Electrostatic paint applicator device
US3970905A (en) * 1974-07-10 1976-07-20 Onoda Cement Company, Ltd. Thin wire type of electric field curtain system
DE3100002A1 (en) * 1980-01-04 1981-11-26 Icab Ind Coating Ab Pulverspritzgeraet
US4316233A (en) * 1980-01-29 1982-02-16 Chato John C Single phase electrohydrodynamic pump
US4647179A (en) * 1984-05-29 1987-03-03 Xerox Corporation Development apparatus
US4700262A (en) * 1985-05-31 1987-10-13 Canadian Patents And Development Limited Continuous electrostatic conveyor for small particles
US4705387A (en) * 1983-12-21 1987-11-10 Xerox Corporation Cleaning apparatus for charge retentive surface
US4743926A (en) * 1986-12-29 1988-05-10 Xerox Corporation Direct electrostatic printing apparatus and toner/developer delivery system therefor
US4752810A (en) * 1985-01-28 1988-06-21 Xerox Corporation Cleaning apparatus for charge retentive surfaces
US4780733A (en) * 1987-12-31 1988-10-25 Xerox Corporation Printing apparatus and toner/developer delivery system therefor
US4876561A (en) * 1988-05-31 1989-10-24 Xerox Corporation Printing apparatus and toner/developer delivery system therefor
US4903050A (en) * 1989-07-03 1990-02-20 Xerox Corporation Toner recovery for DEP cleaning process
US4912489A (en) * 1988-12-27 1990-03-27 Xerox Corporation Direct electrostatic printing apparatus with toner supply-side control electrodes
US4949103A (en) * 1989-08-28 1990-08-14 Xerox Corporation Direct electrostatic printing apparatus and method for making labels
US4949950A (en) * 1989-02-14 1990-08-21 Xerox Corporation Electrostatic sheet transport
WO1992014992A1 (en) * 1991-02-20 1992-09-03 Salmon Peter C Digitally controlled toner delivery method and apparatus
US5275537A (en) * 1993-03-02 1994-01-04 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Magnetic power piston fluid compressor
US5287127A (en) * 1992-02-25 1994-02-15 Salmon Peter C Electrostatic printing apparatus and method
US5555469A (en) * 1991-10-04 1996-09-10 Ricoh Company, Ltd. Image forming apparatus having toner recycling device with electrostatic conveyor
US5842094A (en) * 1994-06-14 1998-11-24 Agfa-Gevaert Conveying device for magnetizable particles
US6059950A (en) * 1995-04-06 2000-05-09 Scientific Generics Limited Travelling wave particle separation apparatus
US6309049B1 (en) 1998-02-18 2001-10-30 The Salmon Group Llc Printing apparatus and method for imaging charged toner particles using direct writing methods
US6374909B1 (en) * 1995-08-02 2002-04-23 Georgia Tech Research Corporation Electrode arrangement for electrohydrodynamic enhancement of heat and mass transfer
US6409975B1 (en) 1999-05-21 2002-06-25 The Texas A&M University System Electrohydrodynamic induction pumping thermal energy transfer system and method
US20030111214A1 (en) * 2001-12-18 2003-06-19 Jamal Seyed-Yagoobi Electrode design for electrohydrodynamic induction pumping thermal energy transfer system
US20040055632A1 (en) * 2002-09-24 2004-03-25 Mazumder Malay K. Transparent self-cleaning dust shield
US6791078B2 (en) 2002-06-27 2004-09-14 Micromass Uk Limited Mass spectrometer
US20040259473A1 (en) * 2003-04-10 2004-12-23 Jack Champaigne Method and apparatus for improving media flow
US20050023453A1 (en) * 2002-08-05 2005-02-03 Bateman Robert Harold Mass spectrometer
US20050067353A1 (en) * 2003-09-30 2005-03-31 Haas Hans E. Molecular motility device
US20080107542A1 (en) * 2006-11-07 2008-05-08 Walter Charles Hernandez Surface to move a fluid via fringe electric fields

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GB201574A (en) * 1922-07-29 1924-10-30 Luke Francis Warren Improvements in or relating to condensing, coalescing and precipitating atmospheric moisture
US1985254A (en) * 1933-06-15 1934-12-25 H H Weaver Electric gun or projectile propelling apparatus
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US3264998A (en) * 1963-09-20 1966-08-09 Martin Marietta Corp Traveling wave high frequency vacuum pump
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Publication number Priority date Publication date Assignee Title
GB201574A (en) * 1922-07-29 1924-10-30 Luke Francis Warren Improvements in or relating to condensing, coalescing and precipitating atmospheric moisture
US1985254A (en) * 1933-06-15 1934-12-25 H H Weaver Electric gun or projectile propelling apparatus
US2224505A (en) * 1938-06-06 1940-12-10 American Foundry Equip Co Electric abrasive projector
US2786416A (en) * 1953-09-25 1957-03-26 English Electric Co Ltd Electro-magnetic pump
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US3122882A (en) * 1960-11-23 1964-03-03 Aerojet General Co Propulsion means
US3325709A (en) * 1963-09-16 1967-06-13 Grace W R & Co Device for electrostatically transporting an unrestrained sheet of dielectric film material
US3264998A (en) * 1963-09-20 1966-08-09 Martin Marietta Corp Traveling wave high frequency vacuum pump
US3440458A (en) * 1966-01-04 1969-04-22 Milton A Knight Electrohydrodynamic alternating current generator

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872361A (en) * 1973-06-04 1975-03-18 Senichi Masuda Electrodynamic apparatus for controlling flow of particulate material
US3970905A (en) * 1974-07-10 1976-07-20 Onoda Cement Company, Ltd. Thin wire type of electric field curtain system
DE2534776A1 (en) * 1974-08-04 1976-02-12 Masuda Senichi Electrostatic paint applicator device
US4011991A (en) * 1974-08-04 1977-03-15 Senichi Masuda Electrostatic powder painting apparatus
DE3100002A1 (en) * 1980-01-04 1981-11-26 Icab Ind Coating Ab Pulverspritzgeraet
US4316233A (en) * 1980-01-29 1982-02-16 Chato John C Single phase electrohydrodynamic pump
US4705387A (en) * 1983-12-21 1987-11-10 Xerox Corporation Cleaning apparatus for charge retentive surface
US4647179A (en) * 1984-05-29 1987-03-03 Xerox Corporation Development apparatus
US4752810A (en) * 1985-01-28 1988-06-21 Xerox Corporation Cleaning apparatus for charge retentive surfaces
US4700262A (en) * 1985-05-31 1987-10-13 Canadian Patents And Development Limited Continuous electrostatic conveyor for small particles
US4743926A (en) * 1986-12-29 1988-05-10 Xerox Corporation Direct electrostatic printing apparatus and toner/developer delivery system therefor
US4780733A (en) * 1987-12-31 1988-10-25 Xerox Corporation Printing apparatus and toner/developer delivery system therefor
US4876561A (en) * 1988-05-31 1989-10-24 Xerox Corporation Printing apparatus and toner/developer delivery system therefor
US4912489A (en) * 1988-12-27 1990-03-27 Xerox Corporation Direct electrostatic printing apparatus with toner supply-side control electrodes
US4949950A (en) * 1989-02-14 1990-08-21 Xerox Corporation Electrostatic sheet transport
US4903050A (en) * 1989-07-03 1990-02-20 Xerox Corporation Toner recovery for DEP cleaning process
US4949103A (en) * 1989-08-28 1990-08-14 Xerox Corporation Direct electrostatic printing apparatus and method for making labels
WO1992014992A1 (en) * 1991-02-20 1992-09-03 Salmon Peter C Digitally controlled toner delivery method and apparatus
US5153617A (en) * 1991-02-20 1992-10-06 Salmon Peter C Digitally controlled method and apparatus for delivering toners to substrates
US5555469A (en) * 1991-10-04 1996-09-10 Ricoh Company, Ltd. Image forming apparatus having toner recycling device with electrostatic conveyor
US5287127A (en) * 1992-02-25 1994-02-15 Salmon Peter C Electrostatic printing apparatus and method
US5275537A (en) * 1993-03-02 1994-01-04 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Magnetic power piston fluid compressor
US5842094A (en) * 1994-06-14 1998-11-24 Agfa-Gevaert Conveying device for magnetizable particles
US6059950A (en) * 1995-04-06 2000-05-09 Scientific Generics Limited Travelling wave particle separation apparatus
US6374909B1 (en) * 1995-08-02 2002-04-23 Georgia Tech Research Corporation Electrode arrangement for electrohydrodynamic enhancement of heat and mass transfer
US6309049B1 (en) 1998-02-18 2001-10-30 The Salmon Group Llc Printing apparatus and method for imaging charged toner particles using direct writing methods
US6409975B1 (en) 1999-05-21 2002-06-25 The Texas A&M University System Electrohydrodynamic induction pumping thermal energy transfer system and method
US20030111214A1 (en) * 2001-12-18 2003-06-19 Jamal Seyed-Yagoobi Electrode design for electrohydrodynamic induction pumping thermal energy transfer system
US7004238B2 (en) * 2001-12-18 2006-02-28 Illinois Institute Of Technology Electrode design for electrohydrodynamic induction pumping thermal energy transfer system
US6791078B2 (en) 2002-06-27 2004-09-14 Micromass Uk Limited Mass spectrometer
US20040227071A1 (en) * 2002-06-27 2004-11-18 Kevin Giles Mass spectrometer
US6914241B2 (en) 2002-06-27 2005-07-05 Micromass Uk Limited Mass spectrometer
US7205538B2 (en) 2002-08-05 2007-04-17 Micromass Uk Limited Mass spectrometer
US20070023638A1 (en) * 2002-08-05 2007-02-01 Bateman Robert H Mass spectrometer
US7071467B2 (en) 2002-08-05 2006-07-04 Micromass Uk Limited Mass spectrometer
US20050023453A1 (en) * 2002-08-05 2005-02-03 Bateman Robert Harold Mass spectrometer
US6911593B2 (en) 2002-09-24 2005-06-28 Board Of Trustees Of The University Of Arkansas Transparent self-cleaning dust shield
US20040055632A1 (en) * 2002-09-24 2004-03-25 Mazumder Malay K. Transparent self-cleaning dust shield
US7291058B2 (en) * 2003-04-10 2007-11-06 Electronics Inc. Method and apparatus for improving media flow
US20040259473A1 (en) * 2003-04-10 2004-12-23 Jack Champaigne Method and apparatus for improving media flow
US20050067353A1 (en) * 2003-09-30 2005-03-31 Haas Hans E. Molecular motility device
US8172159B2 (en) 2006-11-07 2012-05-08 Wch Technologies, Inc. Surface to move a fluid via fringe electric fields
US20080107542A1 (en) * 2006-11-07 2008-05-08 Walter Charles Hernandez Surface to move a fluid via fringe electric fields

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