Patents by Inventor John W. Friederichs

John W. Friederichs 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).

  • Articles of ultra fine grained cemented carbide and process for making same
    Patent number: 5918102
    Abstract: An article made of an ultra fine grained cemented carbide material comprising a transition metal carbide and tungsten carbide having an ultrafine grain size below about 0.6 microns and a process for making the same.
    Type: Grant
    Filed: August 16, 1994
    Date of Patent: June 29, 1999
    Assignee: Valenite Inc
    Inventor: John W. Friederichs
  • Articles of ultra fine grained cemented carbide and process for making same
    Patent number: 5368628
    Abstract: An article made of an ultra fine grained cemented carbide material and a process for making the same.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: November 29, 1994
    Assignee: Valenite Inc.
    Inventor: John W. Friederichs
  • Process for making non-magnetic nickel tungsten carbide cemented carbide compositions and articles made from the same
    Patent number: 5338506
    Abstract: A process for making a non magnetic Ni-WC cemented carbide composition and articles made from the same. The process comprises:(a) dewaxing a green Ni-WC cemented carbide substrate in the presence of hydrogen gas at a pressure less than about 1000 torr and at a sufficient flow rate and a sufficient time to affect the saturation magnetization and magnetic permeability of the Ni-WC cemented carbide substrate;(b) pumping out the hydrogen gas and introducing argon at a pressure in the range of about 1 torr to 1000 torr;(c) increasing the temperature up to the sintering temperature to facilitate sintering of the Ni-WC cemented carbide substrate; and;(d) cooling the furnace to room temperature.The articles made according to this invention are useful as wear parts for electronic instruments and as punches form aluminum beverage cans.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: August 16, 1994
    Assignee: Valenite Inc.
    Inventors: John W. Friederichs, Prakash K. Mirchandani, Paul J. Krudy
  • Nonmagnetic nickel tungsten cemented carbide compositions and articles made from the same
    Patent number: 5273571
    Abstract: A nonmagnetic, NiWC cemented carbide composition and articles made from the same. The addition of chromium renders the composition nonmagnetic independent of the free carbon level in the composition. The composition is useful as wear resistant parts in electronic instruments and as punches to deep draw aluminum beverage cans.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: December 28, 1993
    Assignee: Valenite Inc.
    Inventors: Prakash K. Mirchandani, Laszlo J. Kastura, John W. Friederichs
  • Cutting insert with raised cutting edge
    Patent number: 5123788
    Abstract: A cutting insert having a particular configuration for cutting tough metals such as encountered in the turning of railway wheels is provided with a specific chip breaker configuration which tends to strengthen the negative rake cutting land.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: June 23, 1992
    Assignee: GTE Valenite Corporation
    Inventors: John W. Friederichs, Yefim Val