Patents by Inventor David E. Barr

David E. Barr 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).

  • Aperture marking system and method of marking surface
    Patent number: 8844440
    Abstract: A marking system for cutting an aperture for pipe clearance has a pipe and a pipe stamp. A stamp posterior side has a posterior aperture fluidly connected to an interior cavity. A first rubber stamp projection has an annulus that projects out and away from the stamp anterior surface. A second rubber stamp projection is centrally located on the stamp anterior surface having a general shape of an “X”. The pipe stamp slides over an end of the pipe via the posterior aperture. The first rubber stamp projection and the second rubber stamp projection are placed against a surface for applying a mark for cutting an aperture for pipe clearance.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: September 30, 2014
    Inventor: David E. Barr
  • Electric knife sharpener
    Patent number: D543430
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: May 29, 2007
    Assignee: Edgecraft Corporation
    Inventors: David E. Barr, Daniel D. Friel, Jr.