Patents by Inventor Carl Shumaker

Carl Shumaker 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).

  • Injection molded carbide cutting insert
    Patent number: 6286406
    Abstract: A cutting tool insert includes a cutting tip mounted into a first recess of an injection molded hard refractory compound insert having a second recess of preselected size and shape for locating the insert to a cutting tool. A preferred cutting tip is a diamond and a preferred hard refractory compound is a tungsten carbide with a cobalt binder.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: September 11, 2001
    Assignee: Credo Tool Company
    Inventors: Ramamurthy K. Viswanadham, Carl Shumaker, David Brutscher, Donald C. Pennington, Jr.
  • Carbide cutting insert
    Patent number: 6000312
    Abstract: A cutting tool insert includes a cutting tip mounted into a first recess of a molded hard refractory compound insert having a second recess of preselected size and shape for locating the insert to a cutting tool. A preferred cutting tip is a diamond and a preferred hard refractory compound is a tungsten carbide with a cobalt binder.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: December 14, 1999
    Assignee: Credo Tool Company
    Inventors: R. K. Viswanadham, Carl Shumaker
  • Insert bit for use with a powered screwdriver
    Patent number: 5868047
    Abstract: The present invention relates to the field of insert bits (10) for use with powered screwdrivers. The formed bits (10) may be treated to have a desired microstructure by either an austempering process or by the three step heating, quenching, tempering process. The bits (10) may also be electro-polished. Austempering provides for improved function and increased fatigue life and electro-polishing provides for improved function and increased fatigue life and torque capacity. The bits (10) and may have reduced diameter midportions (30), particularly for use with impact drivers.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: February 9, 1999
    Assignee: Vermont American Corporation
    Inventors: James A. Faust, Marzell Chanton, Carl A. Shumaker
  • Method of making a carbide cutting insert
    Patent number: 5809848
    Abstract: A cutting tool insert includes a cutting tip mounted into a first recess of a molded hard refractory compound insert having a second recess of preselected size and shape for locating the insert to a cutting tool. A preferred cutting tip is a diamond and a preferred hard refractory compound is a tungsten carbide with a cobalt binder.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: September 22, 1998
    Assignee: Credo Tool Company
    Inventors: R. K. Viswanadham, Carl Shumaker
  • Method of making cemented carbide substrate
    Patent number: 5650059
    Abstract: A carbide substrate including a binder prepared to receive a cutting material such as a diamond coating thereon. The substrate is immersed in an electrolyte solution with the substrate acting as the anode thereby providing for an electro-polished substrate surface. The electro-polished substrate surface is then etched to substantially remove the binder phase of the carbide substrate, the etching being to a depth of up to about 15 microns. The resulting surface is susceptible for receiving a coating of the diamond cutting material.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: July 22, 1997
    Assignee: Credo Tool Company
    Inventors: Carl Shumaker, Zane D. Lockhart, Jr., Oscar H. Miller