Patents by Inventor Francis J. Lawson

Francis J. Lawson 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).

  • Mowing device
    Patent number: 5209054
    Abstract: A two-piece cutter member for mounting on a sickle bar has a rigid thin support element arranged for relatively permanent attachment to a sickle bar, and a flat planar pyramid-shaped spring metal blade. A portion of the blade provides at least one bridge or loop for encircling the support element and holding the blade on the support element. A section of either said the portion or the support element is displaced with respect to the support face to releasably hold the blade on the support when the blade is fully positioned on said support element.
    Type: Grant
    Filed: March 21, 1991
    Date of Patent: May 11, 1993
    Assignee: James E. Cummings
    Inventor: Francis J. Lawson
  • Mowing device
    Patent number: 5177943
    Abstract: A two-piece cutter member for mounting on a sickle bar has a rigid thin support element arranged for relatively permanent attachment to a sickle bar, and a flat planar pyramid-shaped spring metal blade. A portion of the blade provides at least one bridge or loop for encircling the support element and holding the blade on the support element. A section of either said the portion or the support element is displaced with respect to the support face to releasably hold the blade on the support when the blade is fully positioned on said support element. The spring metal blade is preferably formed of two thin sheet welded together near their edges.
    Type: Grant
    Filed: October 23, 1991
    Date of Patent: January 12, 1993
    Assignee: Cummings Associates
    Inventor: Francis J. Lawson