Patents by Inventor Jerzey Kreja

Jerzey Kreja 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 hydrostatic axial and radial piston machines and method for the manufacture thereof
    Patent number: 5216943
    Abstract: A method of manufacturing a piston for hydrostatic axial and radial piston machines by non-machining forming, by filling a material that is in a substantially unresistant, formable state into a mold defining a piston outer contour which is closed on all sides, in which at least one supporting core is arranged spaced from the inner contour of the mold to remain in the completed piston to define a core region in the interior of the piston that is closed on all sides, then solidifying the material forming a piston with high strength characteristics and low weight, and removing the completed piston with the enclosed supporting core.
    Type: Grant
    Filed: March 18, 1992
    Date of Patent: June 8, 1993
    Assignee: Hydromatik GmbH
    Inventors: Bernhard Adler, Jerzey Kreja