Patents by Inventor Ehrenfried Horn

Ehrenfried Horn 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 ring with oxide-nitride composite layer
    Patent number: 6726216
    Abstract: A piston ring for use in a cylinder of an internal combustion engine, which ring is nitride-hardened at least on the sliding surface between piston ring and cylinder wall. The nitride layer is composed of a precipitated layer and a compound layer, wherein the piston ring consists of a low-alloyed iron-base material and an oxide layer is deposited on the compound layer.
    Type: Grant
    Filed: June 3, 2002
    Date of Patent: April 27, 2004
    Assignee: Federal-Mogul Friedberg GmbH
    Inventors: Ehrenfried Horn, Rudolf Widmann, Steffen Hoppe
  • Piston ring with oxide-nitride composite layer
    Publication number: 20020180157
    Abstract: A piston ring for use in a cylinder of an internal combustion engine, which ring is nitride-hardened at least on the sliding surface between piston ring and cylinder wall. The nitride layer is composed of a precipitated layer and a compound layer, wherein the piston ring consists of a low-alloyed iron-base material and an oxide layer is deposited on the compound layer.
    Type: Application
    Filed: June 3, 2002
    Publication date: December 5, 2002
    Inventors: Ehrenfried Horn, Rudolf Widmann, Steffen Hoppe