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US 6,923,979 B2Granted
Method for depositing particles onto a substrate using an alternating electric field
AssigneeMicrodose Technologies, Inc.
InventorsRichard Fotland, John Bowers, William Jameson
Life of this patent
Estimating the term…
Abstract
Uniform portions of fine powders are deposited on a substrate by electrostatic attraction in which the charge of the electric field and polarity of the charged particles are varied repeatedly to form a buildup of powder on the carrier surface.
Claims47
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby to drive charged particles from the moving gas stream and deposit said charged particles as oppositely charged layers on said dielectric substrate thus forming a built-up deposit;
- and
- collecting or recirculating the moving gas stream in a closed system.
2 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said aerosol particles comprise particles of dry powder;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said aerosol particles comprise liquid droplets;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said aerosol particles comprise a pharmaceutical;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said alternating electric field has a magnitude between 1 kV/cm and 30 kV/cm;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein substantially all of said aerosol particles are removed from said aerosol to form said deposit;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein the gas of said aerosol is selected from the group consisting of air, nitrogen, and nitrogen/carbon dioxide mixtures;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said dielectric substrate comprises a packaging medium;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric:
- substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said dielectric substrate comprises a pharmaceutical carrier;
- and
- collecting or recirculating the moving gas stream in a closed system.
4 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said dielectric substrate comprises a carrier for carrying said deposit from said deposition zone to a location remote from said deposition zone for further processing;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- and
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit, wherein said dielectric substrate is edible.
1 more element
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region in which a deposition zone is located proximate to said dielectric substrate and applying a charge on said particles in said second region;
- applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said aerosol particles are charged by an ion emitter;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region and applying a charge on said particles in said second region;
- positioning said charged aerosol particles in a deposition zone located in said second region proximate to said dielectric substrate, and applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said particles comprise a solid or a liquid;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode, wherein said particles comprise a pharmaceutical;
- and
- collecting or recirculating the moving gas stream in a closed system.
2 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode, wherein said aerosol carrier is nitrogen gas;
- and
- collecting or recirculating the moving gas stream in a closed system.
2 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said substrate opposite said underlying electrode,
- wherein said dielectric substrate comprises a blister pack;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein said dielectric substrate comprises an electrically insulating material;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein said dielectric substrate is comprised of an electrically conducting material;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein said electrically charging means employs a corona wire or corona emitting points;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- transporting the resulting aerosol as a moving gas stream to a second region and applying a charge on said aerosol particles in said second region;
- positioning said charged aerosol particles in a deposition zone located in said second region proximate to said dielectric substrate, and applying an alternating electric field formed in said deposition zone between a first electrode positioned in said second region and a second electrode positioned underlying and in contact with said dielectric substrate whereby charged particles are removed from the moving gas stream and deposited as oppositely charged layers on said dielectric substrate thus forming a built-up deposit,
- wherein said step of applying an alternating electric field is performed by:
- a charge source comprising a solid dielectric member,
- a first electrode in contact with one side of said solid dielectric member,
- a second electrode in contact with an opposite side of said dielectric member, with an edge surface of said second electrode disposed opposite said first electrode to define an air region at the junction of said edge surface and said solid dielectric member, and
- a source for applying an alternating potential between said first and second electrodes to induce ion producing electrical discharges in the air region between the dielectric member and the edge surface of said second electrode;
- and
- collecting or recirculating the moving gas stream in a closed system.
7 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby charged particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein said particles are electrically charged by triboelectric charging of said aerosol particles or induction charging of said aerosol particles;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein said aerosol particles are charged within said deposition region;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein said electrically alternating field has a magnitude between about 1 kV/cm and about 30 kV/cm;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas steam to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein the pattern of deposited material is defined by an electrically conducting mask disposed adjacent said charging means;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein the aerosol particle mass flow is monitored whereby the mass of deposited particles is controlled;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
A method for depositing particles onto a surface of a dielectric substrate comprising the steps of:
- forming an aerosol of said particles in a first region;
- moving said aerosol as a moving gas stream to a second region and electrically charging said particles in said second region;
- providing an alternating electric field between an electrode underlying said dielectric substrate and said aerosol particles in said second region whereby particles are removed from the gas stream and deposited as a built-up deposit of oppositely charged layers on the surface of said dielectric substrate opposite said underlying electrode,
- wherein multiple deposits are made using multiple deposition regions supplied from a single aerosol source by multiplexing the application of the alternating deposition field between the deposition regions;
- and
- collecting or recirculating the moving gas stream in a closed system.
3 more elements
Dependencies are inferred from the claim text.