Patents by Inventor Michael B. Frappier

Michael B. Frappier 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).

  • Torch height acquisition using arc transfer
    Patent number: 4324971
    Abstract: Initial torch height is acquired by moving a plasma torch toward a workpiece while operating in a pilot mode. The downward movement of the torch is halted when a current sensing relay coupled to the main arc supply senses the transference of the main arc.In a preferred embodiment, the downward movement of the torch is continued until a fixed period of time has passed after the main arc ignition has been sensed.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: April 13, 1982
    Assignee: Thermal Dynamics Corporation
    Inventor: Michael B. Frappier