Patents by Inventor James Lefgren

James Lefgren 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).

  • Publication number: 20100293818
    Abstract: The present invention provides a traction device for a terrain engaging element. The traction device defines a stud having a head portion and a shank portion extending from the head portion and adapted to be secured into the terrain engaging element. A plurality of carbide pellets are bonded together on and to surfaces of the head. The carbide pellets are provided in multiple layers extending across the head surface. The carbide pellets are provided in a stacked relationship to each other so that during use the carbide pellets are capable of being individually dislodged to reveal a carbide pellet of an underlying layer.
    Type: Application
    Filed: April 13, 2010
    Publication date: November 25, 2010
    Inventor: James Lefgren
  • Patent number: 7695078
    Abstract: The present invention provides a traction device for a terrain engaging element. The traction device defines a stud having a head portion and a shank portion extending from the head portion and adapted to be secured into the terrain engaging element. A plurality of spherical carbide pellets are bonded together on and to surfaces of the head. The carbide pellets are provided in multiple layers extending across the head surface. The carbide pellets are provided in a stacked relationship to each other so that during use the carbide pellets are capable of being individually dislodged to reveal a carbide pellet of an underlying layer.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: April 13, 2010
    Inventor: James Lefgren
  • Publication number: 20080148601
    Abstract: The present invention provides a traction device for a terrain engaging element. The traction device defines a stud having a head portion and a shank portion extending from the head portion and adapted to be secured into the terrain engaging element. A plurality of spherical carbide pellets are bonded together on and to surfaces of the head. The carbide pellets are provided in multiple layers extending across the head surface. The carbide pellets are provided in a stacked relationship to each other so that during use the carbide pellets are capable of being individually dislodged to reveal a carbide pellet of an underlying layer.
    Type: Application
    Filed: March 11, 2008
    Publication date: June 26, 2008
    Inventor: James Lefgren
  • Publication number: 20050269878
    Abstract: The present invention provides a traction device for a terrain engaging element. The traction device defines a stud having a head portion and a shank portion extending from the head portion and adapted to be secured into the terrain engaging element. A plurality of generally equally-sized carbide pellets are bonded together on and to the upper surface of the head. The carbide pellets are provided in multiple layers extending across the upper surface of the head. The carbide pellets may be provided in a stacked relationship to each other so that during use the carbide pellets are capable of being individually dislodged to reveal a carbide pellet of an underlying layer.
    Type: Application
    Filed: March 21, 2005
    Publication date: December 8, 2005
    Inventor: James Lefgren
  • Patent number: D659223
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: May 8, 2012
    Inventors: James Lefgren, Travis Hendrickson
  • Patent number: D692646
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: November 5, 2013
    Inventors: James Lefgren, Travis L. Hendrickson
  • Patent number: D712341
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: September 2, 2014
    Inventors: James Lefgren, Travis Hendrickson