Patents by Inventor Richard J. Pfeiffer

Richard J. Pfeiffer 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).

  • Tee-nut with globular shaped sleeve
    Patent number: 6129493
    Abstract: A Tee-nut having a flange head, a plurality of prongs extending from the flange head, and a hollow sleeve extending from the flange head. The hollow sleeve has an internally threaded reduced diameter waist portion connecting to the flange head, and an enlarged globular bulbous portion extending from the internally threaded waist portion. The end of the enlarged bulbous portion is radiussed inwardly to facilitate insertion into a hole in a workpiece. Also disclosed is a workpiece fitted with such a Tee-nut.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: October 10, 2000
    Assignee: Sigma Tool & Machine
    Inventors: Herbert E. Leistner, Paul D. Green, Richard J. Pfeiffer