Patents by Inventor John D. O'Brien

John D. O'Brien 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).

  • Line reel mower
    Patent number: 4653255
    Abstract: A lawnmower apparatus having a plurality of elongated lines or cables fabricated from a plastic material and the like that are arranged for movement about an axis. The lines are attached to rotatable plates or discs such that the apparatus acts as a reel-type lawnmower to cut grass in conjunction with an elongated bar. A resilient assembly maintains appropriate tensioning of the lines during operation of the lawnmower.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: March 31, 1987
    Assignee: John D. O'Brien
    Inventors: John D. O'Brien, Stephen M. Baker, Douglas G. Davidson
  • Bow template
    Patent number: D266630
    Type: Grant
    Filed: October 17, 1980
    Date of Patent: October 26, 1982
    Assignee: Wm. E. Wright Co.
    Inventor: John D. O'Brien
  • Display card
    Patent number: D268010
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: February 22, 1983
    Assignee: Wm. E. Wright Co.
    Inventor: John D. O'Brien