Patents by Inventor Harold F. Armstrong

Harold F. Armstrong 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).

  • Broach and process of manufacturing a broach
    Patent number: 5242251
    Abstract: A broach has replaceable cutting inserts. The inserts are supported to have equal hook and rake angles of about 11.degree. to 14.degree.. A method of producing the broach in a simplified milling setup is described.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: September 7, 1993
    Assignee: Cutting Tool Technologies, Inc.
    Inventors: Harold F. Armstrong, Bruce K. Bakaian
  • Inserted blade end mill
    Patent number: 4357122
    Abstract: In inserted blade rotary end mills having tapered blades inserted in axially extending tapered sockets. The improvement of providing longitudinal interfitting serrations on opposed surfaces of both the inserted blades and sockets to prevent twisting of the blades in the sockets.
    Type: Grant
    Filed: December 17, 1980
    Date of Patent: November 2, 1982
    Assignee: The O.K. Tool Company, Inc.
    Inventors: Thomas Hollis, Jr., Harold F. Armstrong