Patents by Inventor John W. Wittum

John W. Wittum 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).

  • Semi-automatic engine piston assembly tool
    Patent number: 6658713
    Abstract: An assembly tool for insertion of engine piston/rod assemblies into an engine cylinder includes a frame, a support arm pivotally carried on the frame, an insertion cylinder carried by the support arm and including an extendable insertion rod having an end adapted to engage a piston in position for insertion; a positioner for positioning the support arm in an insertion position with the rod end engaging a piston; and a control for actuating the insertion rod to insert a piston/rod assembly into the cylinder. Various additional features of an exemplary embodiment are also disclosed.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: December 9, 2003
    Assignee: General Motors Corporation
    Inventors: John W. Wittum, Christopher W. Zwolensky, Gary C. Spence