Patents by Inventor Christopher Whigham

Christopher Whigham 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).

  • Telescoping chalk holder
    Patent number: 9004794
    Abstract: A telescopic chalk holder for drawing upon a drawing surface and including an outer cylinder having a tip at one end, a chalk stick received within the outer cylinder, the tip in radial receipt of the chalk stick, a push rod received by a second end of the outer cylinder and extending at least a portion of the chalk stick through the tip, and a push rod providing pressure to the chalk stick as the tip is manipulated over the drawing surface.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: April 14, 2015
    Inventor: Christopher Whigham