Patents by Inventor Hans J. Kohnert

Hans J. Kohnert 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).

  • Piston for an internal combustion engine and method for producing same
    Patent number: 4334507
    Abstract: The invention provides a piston formed by casting a metal piston body under pressure around an insert, the body being made of aluminium or aluminium alloy and the insert being made of a porous layer having a thickness 20 to 50 times the pore diameter and completely filled with the piston body metal which projects from the body into the pores of the insert.
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: June 15, 1982
    Assignee: Mahle GmbH
    Inventors: Hans J. Kohnert, Walter Graf, Ladislaus Jakl-Banka, Manfred Rohrle
  • Austenitic cast iron
    Patent number: 4129309
    Abstract: This invention provides an austenitic cast iron especially suitable for reinforcements in aluminium pistons and containing 2-6% Ni, 1.8 to 4.0% C, 1-3% Si, 6-12% Mn, 5-7% Cu, less than 0.08% Cr, 0.3 to 2% Al and 0.05 to 0.3% Ti.
    Type: Grant
    Filed: June 1, 1977
    Date of Patent: December 12, 1978
    Assignee: Mahle GmbH
    Inventors: Hans J. Kohnert, Herbert Smetan