Patents by Inventor Donald A. Botbyl

Donald A. Botbyl 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).

  • Patent number: 6998173
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: February 14, 2006
    Assignee: Kennametal Inc.
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Patent number: 6638474
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: October 28, 2003
    Assignee: Kennametal Inc.
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Publication number: 20030126945
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Application
    Filed: November 13, 2002
    Publication date: July 10, 2003
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Publication number: 20010041107
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Application
    Filed: March 19, 2001
    Publication date: November 15, 2001
    Applicant: Kennametal Inc.,
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield