Patents by Inventor Harold C. Hoyt, Jr.

Harold C. Hoyt, Jr. 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).

  • Electric arc welder that provides non-sticking arc initiation and thereafter maintains the arc
    Patent number: 4523077
    Abstract: An electric arc welder has a current-conducting means which can supply welding power to an arc along a first volt-ampere curve, has a second current-conducting means which can be paralleled with the first current-conducting means to supply welding power to that arc along a second and distinctly-different volt-ampere curve, has a voltage-sensing circuit which senses the arc voltage, and has a control circuit which automatically and virtually-instantaneously shifts the supplying of welding power from a point on the first volt-ampere curve to a point of essentially-equal potential on the second and distinctly-different volt-ampere curve when the voltage-sensing circuit senses that the arc voltage has fallen below a predetermined value.
    Type: Grant
    Filed: June 16, 1983
    Date of Patent: June 11, 1985
    Assignee: Big Four Manufacturing Company, Inc.
    Inventors: Harold C. Hoyt, Jr., Danilo C. Martinez, Stanley M. Philipak
  • Electric welder with current-voltage feedback circuit that provides desired slope curve
    Patent number: 4465920
    Abstract: A D.C. welder includes an engine-driven D.C. generator, a polarity-revers switch which can change the direction of current flow through the field winding of that generator to provide a positive or negative polarity at the welder output terminals, a circuit that automatically permits only uni-directional current flow through that field winding during the starting of the engine, and a further circuit that energizes a solenoid to close contacts which enable that generator to operate as the starting motor for that engine but which thereafter de-energizes that solenoid and then keeps it de-energized until the engine is at, or close to, rest.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: August 14, 1984
    Assignee: Teledyne-Walterboro, a Division of Teledyne Industries, Inc.
    Inventors: Harold C. Hoyt, Jr., William J. Greene
  • Electric welder
    Patent number: 4293756
    Abstract: A D.C. welder includes an engine-driven D.C. generator, a polarity-reversing switch which can change the direction of current flow through the field winding of that generator to provide a positive or negative polarity at the welder output terminals, a circuit that automatically permits only uni-directional current flow through that field winding during the starting of the engine, and a further circuit that energizes a solenoid to close contacts which enable that generator to operate as the starting motor for that engine but which thereafter de-energizes that solenoid and then keeps it de-energized until the engine is at, or close to, rest.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: October 6, 1981
    Assignee: Teledyne Walterboro
    Inventors: Harold C. Hoyt, Jr., William J. Greene