Patents by Inventor Roger W. Hewett

Roger W. Hewett 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).

  • Low voltage electrical based parts-in-place (PIP) system for contact start torch
    Patent number: 5961855
    Abstract: A detection system for a cutting torch for use in connection with a workpiece. The detection system has an electrode and a tip. A housing supporting the tip and the electrode provides relative movement therebetween and allows electrical contact between the tip and the electrode. A sensor circuit senses when the electrode and the tip are in electrical contact. The sensor circuit generates a switch control signal when the electrode and tip are in electrical contact. A power supply provides a first voltage and a second voltage such that a potential voltage difference is established between the electrode and the and/or workpiece. A magnitude of the first voltage is less than a magnitude of the second voltage.
    Type: Grant
    Filed: January 28, 1998
    Date of Patent: October 5, 1999
    Assignee: Thermal Dynamics Corporation
    Inventors: Roger W. Hewett, Murray Michaels