Patents by Inventor David M. Letsche

David M. Letsche 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).

  • Welding light
    Patent number: 4303967
    Abstract: This light is designed for use in the welding industry, for checking joint preparations, by lighting the area to be welded, lighting the area of a weld, so as to enable the user effectively to clean or chip slag from it, etc. It consists primarily of a sleeve, in which a high voltage bulb is received, that includes a resistor across the leads, and it is mounted to any electrode holder, by a ball and socket swivel, for changing the light angle.
    Type: Grant
    Filed: March 21, 1980
    Date of Patent: December 1, 1981
    Assignee: David M. Letsche
    Inventor: David M. Letsche