Patents by Inventor David A. Laing

David A. Laing 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).

  • Publication number: 20020158005
    Abstract: An apparatus and method for removing debris suspended in a main fluid flow using a fluid strainer that uses an integrated nozzle/diffuser for discharging debris that is dislodged from an internal porous surface.
    Type: Application
    Filed: April 27, 2001
    Publication date: October 31, 2002
    Inventor: David A. Laing
  • Patent number: 6177022
    Abstract: A self-cleaning fuel oil strainer, coupled to a continuous fuel flow, that includes a pair of canisters, each having a cylindrical wedge wire fuel oil filter screen. An elongated brush running the length of the screen is disposed between two confining walls also running the length of the screen to form a chamber. A elongated partition, including two sets of apertures, is used, along with the elongated brush, to divide the chamber into two particulate dislodge chambers and a drain subchamber. A drain is in fluid communication with the drain subchamber. During cleaning, the drain is opened and the screen is rotated against the brush for liberating the particulate contaminants and a limited amount of fuel oil into the two dislodge subchambers. The particulate contaminants and the limited amount of fuel oil then pass through the apertures at a high velocity and into the drain subchamber which exits through the drain.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: January 23, 2001
    Inventors: James Benenson, Jr., David A. Laing
  • Patent number: 4841359
    Abstract: A photographic system where a still camera (21) and a video camera (20) are employed to view and photograph an object. The video camera (20) is employed to capture images of an object and each image is combined with a unique code. The still camera (21) produces latent images correspondingly coded and the video images may be printed or displayed on an image printer (23) to enable a selection of desired prints to be made without the need to process the film of the still camera (21) to provide proofs.
    Type: Grant
    Filed: November 12, 1987
    Date of Patent: June 20, 1989
    Assignee: Bryna Pty. Ltd.
    Inventors: Ross H. Hawkins, David Laing, Bryan C. Bedington
  • Patent number: 4469311
    Abstract: A semi-automatic, motorized hand torch, or gas cutting machine, that is capable of being freely operated with one hand and characterized by device head having a cutting torch tip, respective conduit means for supplying to the tip preheat oxygen, cutting oxygen and fuel gas, a drive cylinder journalled for rotation about the tip, a drive wheel engaging the peripherally outer cylindrical wall of the drive cylinder so as to be driven thereby and moveable longitudinally therealong so as allow adjustment in height of the tip, a motor and transmission drivingly connected with a drive cylinder, control for controlling the motor, housing and bracket for supporting the drive wheel adjacent the tip. Also disclosed are specific preferred embodiments including those in which respective small and large circle cutting attachments are employed and wherein an angled cutting wheel and strut are employed for cutting at an angle, as well as specific preferred structure.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: September 4, 1984
    Assignee: Victor Equipment Company
    Inventor: David A. Laing
  • Patent number: 4327898
    Abstract: What is disclosed is a traveling torch comprising a carriage mounted on wheels and adapted to traverse a track; motor and variable speed traction drive transmission for moving the carriage along the track and carried by the carriage with the weight of the motor toward a first side; a torch rack holder for holding a torch, the torch rack holder being carried by the carriage with its weight toward a first side, the torch rack holder being asymmetrically mounted and extending above and across the carriage so as to carry the torch laterally beyond the second side of the carriage; a torch having a body, tip, and respective fuel and oxygen passageways connected with respective fuel and oxygen conduit means for conveying respective fuel and oxygen to respective fuel and oxygen passageways in the torch and flexible fuel and oxygen conduits connected with respective sources.
    Type: Grant
    Filed: April 3, 1981
    Date of Patent: May 4, 1982
    Assignee: Victor Equipment Company
    Inventors: Gerald B. Grant, Roger J. Madsen, David A. Laing