Patents by Inventor David B. McDonald

David B. McDonald 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).

  • Patent number: 8618445
    Abstract: A heating system which may include a bonding membrane having a water permeable lamina, an electrically conductive ink-based radiant heater, and a first adhesive adapted to adhere to both the conductive ink-based radiant heater and the bonding membrane. The heating system may be incorporated in a floor including a substrate, the heating system and a decorative floor surface. The heating system may also be in the form of a multilayer panel having a bonding membrane, an electrically conductive ink-based heater including a plurality of electrically resistive strips printed on a first polymer sheet connected by electrically conductive buses, and electrical conductors extending from the buses to at least an edge of the panel.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: December 31, 2013
    Assignee: United States Gypsum Company
    Inventors: Ashish Dubey, David B. McDonald, James M. Ullett
  • Patent number: 7948184
    Abstract: A vehicle testing lamp system comprising an onboard controller unit, an off-board controller unit, and a lamp fixture. The onboard controller unit comprises a solid state relay, the solid state relay being switchable between an idle output power setting and a high output power setting; a timing circuit,; a transfer circuit; a current sensor; a current regulator; and batteries or other auxiliary power supply. The off-board controller unit comprises a power supply electrically connected to a voltage booster circuit. The lamp fixture comprises an ignitor; a shock mount; and a lamp that is electrically connected to the igniter. The off-board controller supplies power to the lamp at its idle level. The onboard transfer circuit permits the off-board power supply to be disconnected while the onboard controller unit maintains the lamp at idle, and the onboard timing circuit limits the time that the lamp remains at high output. Also disclosed is a method for using a vehicle testing lamp system.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: May 24, 2011
    Assignee: Luminys Systems Corp.
    Inventors: David M. Heffelfinger, David A. Pringle, David B. McDonald, Ashot Nalbandyan
  • Patent number: 7861955
    Abstract: The process of the present invention includes obtaining a feed material having an initial median particle size. A solution of a polycarboxylate dispersant in water is formed, then the feed material is added to the solution to form a slurry. The slurry is wet-ground to reduce the median particle size of the feed material. Optionally, the total amount of polycarboxylate dispersant is divided into a plurality of doses that are added periodically over the total grinding time.
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: January 4, 2011
    Assignee: United States Gypsum Company
    Inventors: Sharon Louise Tracy, David B. McDonald, Qingxia Liu
  • Publication number: 20100065543
    Abstract: A heating system which may include a bonding membrane having a water permeable lamina, an electrically conductive ink-based radiant heater, and a first adhesive adapted to adhere to both the conductive ink-based radiant heater and the bonding membrane. The heating system may be incorporated in a floor including a substrate, the heating system and a decorative floor surface. The heating system may also be in the form of a multilayer panel having a bonding membrane, an electrically conductive ink-based heater including a plurality of electrically resistive strips printed on a first polymer sheet connected by electrically conductive buses, and electrical conductors extending from the buses to at least an edge of the panel.
    Type: Application
    Filed: September 16, 2009
    Publication date: March 18, 2010
    Inventors: Ashish Dubey, David B. McDonald
  • Publication number: 20090127360
    Abstract: The process of the present invention includes obtaining a feed material having an initial median particle size. A solution of a polycarboxylate dispersant in water is formed, then the feed material is added to the solution to form a slurry. The slurry is wet-ground to reduce the median particle size of the feed material. Optionally, the total amount of polycarboxylate dispersant is divided into a plurality of doses that are added periodically over the total grinding time.
    Type: Application
    Filed: November 15, 2007
    Publication date: May 21, 2009
    Inventors: Sharon Louise Tracy, David B. McDonald, Qingxia Liu
  • Publication number: 20080245007
    Abstract: A generally planar, structural insulated panel for building construction includes a pair of outer facings disposed on opposed surfaces of a plastic foam core. Both of the outer facings are gypsum cellulose fiber board such as gypsum wood fiber board. Disposed on the exterior surface of the gypsum wood fiber board on the exterior surface and between another expanded polystyrene insulation panel is a weather resistant barrier that is fastened to the gypsum wood fiber board. The exterior surface of the second insulation panel is fastened to the gypsum wood fiber board by mechanical fasteners. The insulation panels are then coated with a basecoat which has an embedded mesh reinforcement and then a finishing coat is applied to the base coating. Vinyl or aluminum metal siding can be fastened to the structural assembly by G screw fasteners or other mechanical fasteners.
    Type: Application
    Filed: April 4, 2007
    Publication date: October 9, 2008
    Applicant: United States Gypsum Company
    Inventor: David B. MCDONALD
  • Publication number: 20080116814
    Abstract: A vehicle testing lamp system comprising an onboard controller unit, an off-board controller unit, and a lamp fixture. The onboard controller unit comprises a solid state relay, the solid state relay being switchable between an idle output power setting and a high output power setting; a timing circuit; a transfer circuit; a current sensor; a current regulator; and batteries or other auxiliary power supply. The off-board controller unit comprises a power supply electrically connected to a voltage booster circuit. The lamp fixture comprises an ignitor; a shock mount; and a lamp that is electrically connected to the igniter. The off-board controller supplies power to the lamp at its idle level. The onboard transfer circuit permits the off-board power supply to be disconnected while the onboard controller unit maintains the lamp at idle, and the onboard timing circuit limits the time that the lamp remains at high output. Also disclosed is a method for using a vehicle testing lamp system.
    Type: Application
    Filed: October 2, 2007
    Publication date: May 22, 2008
    Inventors: David M. Heffelfinger, David A. Pringle, David B. McDonald, Ashot Nalbandyan
  • Patent number: 4683913
    Abstract: A rotary air valve mounted in a case for rotatable movement about an axis to close either one of two adjacent openings has a flexible elastomeric seal that flexibly engages inwardly and outwardly facing curved sealing surfaces on the case to seal the respective openings when the valve closes same. The sealing surfaces have a radius of curvature whose axis is offset from that of the valve so that a predetermined contact pressure is established along the seal at the curved sealing surfaces to tightly seal the openings when the valve is closed but diminishes to zero immediately as the valve is rotated to open either opening to thereafter permit further opening of the valve uninhibited by the seal.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: August 4, 1987
    Assignee: General Motors Corporation
    Inventors: Donald E. Hoffman, David B. McDonald
  • Patent number: 4513771
    Abstract: An air valve is disclosed having a valve plate with a snap-in lever-bearing at one end and a similar lever-bearing at the opposite end or optionally a snap-in bearing without a lever at the latter end.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: April 30, 1985
    Assignee: General Motors Corporation
    Inventors: Michael J. Thomas, David B. McDonald