Patents by Inventor Helmut J. Kaufmann

Helmut J. Kaufmann 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).

  • High hardness/high compressive stress multilayer coated tool
    Patent number: 5075181
    Abstract: A cutting tool is provided composed of a hard substrate having a PVD coating thereon having three layers. The innermost or first layer is composed of a group IVB (titanium, hafnium or zirconium) metal nitride. The middle or second layer is composed of a group IVB carbonitride. The outermost or third layer is also composed of a group IVB metal nitride. The PVD coating is characterized by high hardness and high residual compressive stresses.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: December 24, 1991
    Assignees: Kennametal Inc., Balzers Limited
    Inventors: Dennis T. Quinto, Helmut J. Kaufmann