Patents by Inventor Francis A. Schaefer

Francis A. Schaefer 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).

  • Sprocketed drive assembly for track-type machine
    Patent number: 8070240
    Abstract: A sprocket assembly for a track-type machine comprises a plurality of teeth, radially-disposed about a center of the sprocket assembly, each of the plurality of teeth comprising opposing tooth flanks, wherein successive pairs of teeth defines a substantially concave channel for receiving therein a cylindrical pin member associated with a track link member of a continuous track chain, each tooth flank having a tooth angle less than about 17 degrees.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: December 6, 2011
    Assignee: Caterpillar Inc.
    Inventors: Jianping Zheng, Daniel Marcel Désiré Angot, David Francis Schaefer, Selvaraj Kuppannan
  • Sprocketed drive assembly for track-type machine
    Publication number: 20100156170
    Abstract: A sprocket assembly for a track-type machine comprises a plurality of teeth, radially-disposed about a center of the sprocket assembly, each of the plurality of teeth comprising opposing tooth flanks, wherein successive pairs of teeth defines a substantially concave channel for receiving therein a cylindrical pin member associated with a track link member of a continuous track chain, each tooth flank having a tooth angle less than about 17 degrees.
    Type: Application
    Filed: December 18, 2008
    Publication date: June 24, 2010
    Inventors: Jianping Zheng, Daniel Marcel Desire Angot, David Francis Schaefer, Selvaraj Kuppannan
  • Vest
    Patent number: D243723
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: March 22, 1977
    Assignee: Rocky Mountain Featherbed Company, Inc.
    Inventor: Francis A. Schaefer
  • Jacket
    Patent number: D243724
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: March 22, 1977
    Assignee: Rocky Mountain Featherbed Company, Inc.
    Inventor: Francis A. Schaefer