Patents by Inventor Larry Church

Larry Church 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).

  • Two-stage switch-mode power supply for drawn-arc stud welding
    Patent number: 10279415
    Abstract: A drawn arc welding device includes a welding tool, and an energy storage device coupled to a power source. A charging circuit is connected to the energy storage device replenishing the storage device. A discharge circuit is connected to the welding tool and energy storage device. The discharge circuit regulates and adjusts a welding current of the welding tool to a specified amount. Also disclosed is a process that includes charging the energy storage device, actuating the welding tool, energizing a pilot arc current, lifting the weld stud off a workpiece to draw the pilot arc, energizing a welding arc wherein the discharge circuit regulates a welding current of the welding tool to a specified amount, and plunging the weld stud into the workpiece and turning off the discharge circuit.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: May 7, 2019
    Assignee: Nelson Stud Welding, Inc.
    Inventors: Christopher Hsu, Larry Church
  • Capacitor charge and discharge circuit for fastener welding
    Patent number: 8410399
    Abstract: A capacitor discharge (CD) fastener welding circuit including: an input voltage source; a rectifier bridge of diodes receiving the input voltage source; at least two capacitor charge switches linked with the rectifier bridge; at least one capacitor linked with the at least two capacitor charge switches; and at least two capacitor discharge switches linked with the capacitor and to welding output terminals.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: April 2, 2013
    Assignee: Nelson Stud Welding, Inc.
    Inventors: Christopher Hsu, Larry Church, Jeffrey J. Krupp
  • TWO-STAGE SWITCH-MODE POWER SUPPLY FOR DRAWN-ARC STUD WELDING
    Publication number: 20130062327
    Abstract: A drawn arc welding device includes a welding tool, and an energy storage device coupled to a power source. A charging circuit is connected to the energy storage device replenishing the storage device. A discharge circuit is connected to the welding tool and energy storage device. The discharge circuit regulates and adjusts a welding current of the welding tool to a specified amount. Also disclosed is a process that includes charging the energy storage device, actuating the welding tool, energizing a pilot arc current, lifting the weld stud off a workpiece to draw the pilot arc, energizing a welding arc wherein the discharge circuit regulates a welding current of the welding tool to a specified amount, and plunging the weld stud into the workpiece and turning off the discharge circuit.
    Type: Application
    Filed: September 13, 2011
    Publication date: March 14, 2013
    Applicant: Nelson Stud Welding, Inc.
    Inventors: Christopher Hsu, Larry Church
  • CAPACITOR CHARGE AND DISCHARGE CIRCUIT FOR FASTENER WELDING
    Publication number: 20100170880
    Abstract: A capacitor discharge (CD) fastener welding circuit including: an input voltage source; a rectifier bridge of diodes receiving the input voltage source; at least two capacitor charge switches linked with the rectifier bridge; at least one capacitor linked with the at least two capacitor charge switches; and at least two capacitor discharge switches linked with the capacitor and to welding output terminals.
    Type: Application
    Filed: December 17, 2009
    Publication date: July 8, 2010
    Applicant: Nelson Stud Welding, Inc.
    Inventors: Christopher Hsu, Larry Church, Jeffrey J. Krupp
  • Transparency imaging process
    Patent number: 5790160
    Abstract: A method and an apparatus for processing an image transparency entails the application of an intermediate transfer surface of a layer of sacrificial liquid to a supporting surface and the deposition of a phase change ink onto the liquid layer. The inked image is then contact transferred to an optically transmissive final receiving substrate, such as a plastic transparency.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: August 4, 1998
    Assignee: Tektronix, Inc.
    Inventors: Barry D. Reeves, Loc V. Bui, Clark W. Crawford, James D. Rise, Barry E. Morgan, Larry Church, Mark Parker