Patents by Inventor Duane Stotland

Duane Stotland 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).

  • Tennis instructional aid and method
    Patent number: 4948372
    Abstract: Tennis gauge 10 uses a plurality of adhesive dots 11 and 12 to teach relative positioning of a tennis player on tennis court 1 with respect to the bouncing point of a ground stroked tennis ball. First indicia adhesive dots 11 are positioned along service box centerlines 7 nine feet fore and aft service line 4. Second indicia adhesive dots 12 are attached along the longitudinal service box centerline 7 at points nine feet aft base lines 6. Tennis player uses the adhesive dots to indicate the relative distance behind the bouncing point of a ground stroked tennis ball for the return stroke.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: August 14, 1990
    Inventor: Duane Stotland