Patents by Inventor David G. Doman
David G. Doman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7902114Abstract: Using zeolites as the active adsorbent, adsorbent laminates have been fabricated with various sheet supports. These adsorbent laminates have been successfully operated for oxygen enrichment at high PSA cycle frequencies, such as upwards of at least 150 cycles per minute. Methods for making suitable adsorbent laminates are described. The methods generally involve forming a slurry comprising a liquid suspending agent, an adsorbent and a binder. Laminates are made by applying the slurry to support material or admixing support material with the slurry. The slurry can be applied to support material using a variety of techniques, including roll coaters, split roll coaters, electrophoretic deposition, etc. One method for making laminates by mixing support material with the adsorbent slurry comprises depositing the slurry onto a foraminous wire, draining the slurry material, and pressing the material to form a ceramic adsorbent paper. Spacers can be formed on adsorbent laminates to space one laminate from another.Type: GrantFiled: October 22, 2007Date of Patent: March 8, 2011Assignee: Xebec Adsorption Inc.Inventors: Bowie G. Keefer, Alain A. Carel, Brian G. Sellars, Ian S. D. Shaw, Belinda C. Larisch, David G. Doman, Frederick K. Lee, Andrea C. Gibbs, Bernard H. Hetzler, James A. Sawada, Aaron M. Pelman, Carl F. Hunter
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Publication number: 20090025553Abstract: Using zeolites as the active adsorbent, adsorbent laminates have been fabricated with various sheet supports. These adsorbent laminates have been successfully operated for oxygen enrichment at high PSA cycle frequencies, such as upwards of at least 150 cycles per minute. Methods for making suitable adsorbent laminates are described. The methods generally involve forming a slurry comprising a liquid suspending agent, an adsorbent and a binder. Laminates are made by applying the slurry to support material or admixing support material with the slurry. The slurry can be applied to support material using a variety of techniques, including roll coaters, split roll coaters, electrophoretic deposition, etc. One method for making laminates by mixing support material with the adsorbent slurry comprises depositing the slurry onto a foraminous wire, draining the slurry material, and pressing the material to form a ceramic adsorbent paper. Spacers can be formed on adsorbent laminates to space one laminate from another.Type: ApplicationFiled: October 22, 2007Publication date: January 29, 2009Inventors: Bowie G. Keefer, Alain A. Carel, Brian G. Sellars, Ian S.D. Shaw, Belinda C. Larisch, David G. Doman, Frederick K. Lee, Andrea C. Gibbs, Bernard H. Hetzler, James A. Sawada, Aaron M. Pelman, Carl F. Hunter
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Patent number: 7094275Abstract: A rotary module for implementing a high frequency pressure swing adsorption process comprises a stator and a rotor rotatably coupled to the stator. The stator includes a first stator valve surface, a second stator valve surface, a plurality of first function compartments opening into the first stator valve surface, and a plurality of second function compartments opening into the second stator valve surface. The rotor includes a first rotor valve surface in communication with the first stator valve surface, a second rotor valve surface in communication with the second stator valve surface, and a plurality of flow paths for receiving adsorbent material therein.Type: GrantFiled: July 14, 2003Date of Patent: August 22, 2006Assignee: QuestAir Technologies, Inc.Inventors: Bowie G. Keefer, David G. Doman, Christopher R. McLean
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Publication number: 20040197596Abstract: A parallel passage contactor structure which advantageously does not require a spacing member is provided according to the present invention. In an embodiment of the present invention a parallel passage contactor is provided comprising multiple layers of sheet material wherein the sheet material is perforated with a regular pattern of openings. The perforated openings in the sheet material comprising the layers of the contactor structure are arranged such that when multiple similarly perforated layers of material are suitably layered in contact with each other the perforated openings in adjacent layers form substantially continuous parallel passages suitable for the conduction of fluids.Type: ApplicationFiled: February 3, 2004Publication date: October 7, 2004Applicant: QuestAir Technologies Inc.Inventors: Denis J. Connor, David G. Doman
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Patent number: 6565635Abstract: Disclosed embodiments of the apparatus address the challenges of rotary PSA systems, both axial and radial flow, with M>1 by providing interpenetrating, layered manifolds to accommodate all of the steps of a complex PSA cycle, suitable with equal compactness for any value of “M”. This approach extends readily to accommodate a plurality of rotary PSA modules and their cooperating compression machinery within a single layered manifold assembly for a single PSA plant train. Described embodiments of the rotary PSA apparatus include stators that define fluid ports. In particular embodiments of the described apparatus, a second stator defines pressure swing adsorption cycle sectors, each sector being defined by a light product delivery port, light product withdrawal ports, and light reflux return ports. The adsorber elements may directly contact one or more of the stators in a fluidly sealing manner (i.e., have a clearance gap of from about 0 to about 50 microns) using described reinforced adsorbers.Type: GrantFiled: September 25, 2001Date of Patent: May 20, 2003Assignee: QuestAir Technologies, Inc.Inventors: Bowie G. Keefer, Matthew Babicki, Brian Sellars, Ian Spencer Parker, David G. Doman, Alain Carel, Surajit Roy
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Publication number: 20030070550Abstract: A rotary module for implementing a high frequency pressure swing adsorption process comprises a stator and a rotor rotatably coupled to the stator. The stator includes a first stator valve surface, a second stator valve surface, a plurality of first function compartments opening into the first stator valve surface, and a plurality of second function compartments opening into the second stator valve surface. The rotor includes a first rotor valve surface in communication with the first stator valve surface, a second rotor valve surface in communication with the second stator valve surface, and a plurality of flow paths for receiving adsorbent material therein.Type: ApplicationFiled: September 16, 2002Publication date: April 17, 2003Inventors: Bowie Gordon Keefer, David G. Doman, Christopher R. McLean
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Publication number: 20020170436Abstract: Using zeolites as the active adsorbent, adsorbent laminates have been fabricated with various sheet supports. These adsorbent laminates have been successfully operated for oxygen enrichment at high PSA cycle frequencies, such as upwards of at least 150 cycles per minute. Methods for making suitable adsorbent laminates are described. The methods generally involve forming a slurry comprising a liquid suspending agent, an adsorbent and a binder. Laminates are made by applying the slurry to support material or admixing support material with the slurry. The slurry can be applied to support material using a variety of techniques, including roll coaters, split roll coaters, electrophoretic deposition, etc. One method for making laminates by mixing support material with the adsorbent slurry comprises depositing the slurry onto a foraminous wire, draining the slurry material, and pressing the material to form a ceramic adsorbent paper. Spacers can be formed on adsorbent laminates to space one laminate from another.Type: ApplicationFiled: January 7, 2002Publication date: November 21, 2002Inventors: Bowie G. Keefer, Alain A. Carel, Brian G. Sellars, Ian S.D. Shaw, Belinda C. Larisch, David G. Doman, Frederick K. Lee, Andrea C. Gibbs, Bernard H. Hetzler, James A. Sawada, Aaron M. Pelman, Carl F. Hunter
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Patent number: 6451095Abstract: A rotary module for implementing a high frequency pressure swing adsorption process comprises a stator and a rotor rotatably coupled to the stator. The stator includes a first stator valve surface, a second stator valve surface, a plurality of first function compartments opening into the first stator valve surface, and a plurality of second function compartments opening into the second stator valve surface. The rotor includes a first rotor valve surface in communication with the first stator valve surface, a second rotor valve surface in communication with the second stator valve surface, and a plurality of flow paths for receiving adsorbent material therein.Type: GrantFiled: September 18, 2000Date of Patent: September 17, 2002Assignee: QuestAir Technologies, Inc.Inventors: Bowie Gordon Keefer, David G. Doman, Christopher R. McLean
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Patent number: 6406523Abstract: Gas separation by pressure swing adsorption (PSA) is performed within an apparatus having a plurality of adsorbers cooperating with first and second valves in a rotary PSA module, with the PSA cycle characterized by multiple intermediate pressure levels between the higher and lower pressures of the PSA cycle. Gas flows enter or exit the PSA module at the intermediate pressure levels as well as the higher and lower pressure levels, under substantially steady conditions of flow and pressure. The PSA module comprises a rotor containing laminated sheet adsorbers and rotating within a stator, with ported valve faces between the rotor and stator to control the timing of the flows entering or exiting the adsorbers in the rotor.Type: GrantFiled: June 9, 2000Date of Patent: June 18, 2002Assignee: QuestAir Technologies, Inc.Inventors: Denis J. Connor, David G. Doman, Les Jeziorowski, Bowie G. Keefer, Belinda Larisch, Christopher McLean, Ian Shaw
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Publication number: 20020066367Abstract: Disclosed embodiments of the apparatus address the challenges of rotary PSA systems, both axial and radial flow, with M>1 by providing interpenetrating, layered manifolds to accommodate all of the steps of a complex PSA cycle, suitable with equal compactness for any value of “M”. This approach extends readily to accommodate a plurality of rotary PSA modules and their cooperating compression machinery within a single layered manifold assembly for a single PSA plant train. Described embodiments of the rotary PSA apparatus include stators that define fluid ports. In particular embodiments of the described apparatus, a second stator defines pressure swing adsorption cycle sectors, each sector being defined by a light product delivery port, light product withdrawal ports, and light reflux return ports. The adsorber elements may directly contact one or more of the stators in a fluidly sealing manner (i.e., have a clearance gap of from about 0 to about 50 microns) using described reinforced adsorbers.Type: ApplicationFiled: September 25, 2001Publication date: June 6, 2002Inventors: Bowie G. Keefer, Matthew Babicki, Brian Sellars, Ian Spencer Parker, David G. Doman, Alain Carel, Surajit Roy
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Patent number: 6051050Abstract: Pressure swing adsorption (PSA) separation of a feed gas mixture is performed within an apparatus having typically a single prime mover powering a feed compressor for one or multiple rotary PSA modules in parallel, each module including a rotor with a large number of angularly spaced adsorber elements, with valve surfaces between the rotor and a stator so that individual adsorber elements are opened to compartments for staged pressurization and blowdown, with thermally boosted energy recovery from staged expansion of countercurrent blowdown and light reflux gases, and a plurality of adsorber elements opened at any instant to each compartment so that each compressor and expander stage operates under substantially steady conditions of flow and pressure.Type: GrantFiled: December 22, 1997Date of Patent: April 18, 2000Assignee: Questor Industries Inc.Inventors: Bowie G. Keefer, David G. Doman
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Patent number: 4977817Abstract: A displacement apparatus for allowing relative displacement between two reciprocating members such that a predetermined output motion profile of one of the members may be obtained relative to the motion of the other of the reciprocating members.Type: GrantFiled: November 7, 1988Date of Patent: December 18, 1990Inventor: David G. Doman
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Patent number: 4778554Abstract: A method and apparatus for rapidly bonding two surfaces which are associated with paper elements and corrugated paper elements. A heater plate is utilized to raise the temperature of one of the surfaces while a water based adhesive is applied to the other of said surfaces, which other surface remains at ambient temperature. The heated and ambient surfaces are subsequently contacted and pressure is applied between the surfaces until the bonding is complete.Type: GrantFiled: April 7, 1986Date of Patent: October 18, 1988Assignee: Western Packaging Company, Ltd.Inventor: David G. Doman
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Patent number: RE40006Abstract: Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. The invention provides rotary multiport distributor valves to control the timing sequence of the PSA cycle steps between the beds, with flow controls cooperating with the rotary distributor valves to control the volume rates of gas flows to and from the adsorbent beds in blowdown, purge, equalization and repressurization steps.Type: GrantFiled: April 12, 2004Date of Patent: January 22, 2008Assignee: QuestAir Technologies Inc.Inventors: Bowie G. Keefer, David G. Doman
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Patent number: RE38493Abstract: Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. The invention provides rotary multiport distributor valves to control the timing sequence of the PSA cycle steps between the beds, with flow controls cooperating with the rotary distributor valves to control the volume rates of gas flows to and from the adsorbent beds in blowdown, purge, equalization and repressurization steps.Type: GrantFiled: May 16, 2002Date of Patent: April 13, 2004Assignee: QuestAir Technologies Inc.Inventors: Bowie G. Keefer, David G. Doman