Patents by Inventor Daniel J. Dufek

Daniel J. Dufek 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).

  • Coated piston ring for an internal combustion engine
    Patent number: 12578016
    Abstract: A coated piston ring for a piston is provided. The piston ring includes a running surface, a flank surface, and a transition surface therebetween. The transition surface curves or extends at an angle between the running surface and the flank surface. A running layer is disposed over the running surface and over at least a portion of the transition surface. A flank layer is disposed over the flank surface and over at least a portion of the transition surface. The running layer is applied by physical vapor deposition, and the running layer is applied by galvanic deposition. The running layer is formed of chromium nitride, and the flank layer is formed of chromium. A portion of the flank layer overlaps and is disposed outward of a portion of the running layer. During operation of the piston, the overlapping portion is spaced from both the piston and the cylinder.
    Type: Grant
    Filed: May 12, 2021
    Date of Patent: March 17, 2026
    Assignee: Federal-Mogul Powertrain LLC
    Inventors: Daniel J. Dufek, Marc Irrgeher
  • COATED PISTON RING FOR AN INTERNAL COMBUSTION ENGINE
    Publication number: 20220364643
    Abstract: A coated piston ring for a piston is provided. The piston ring includes a running surface, a flank surface, and a transition surface therebetween. The transition surface curves or extends at an angle between the running surface and the flank surface. A running layer is disposed over the running surface and over at least a portion of the transition surface. A flank layer is disposed over the flank surface and over at least a portion of the transition surface. The running layer is applied by physical vapor deposition, and the running layer is applied by galvanic deposition. The running layer is formed of chromium nitride, and the flank layer is formed of chromium. A portion of the flank layer overlaps and is disposed outward of a portion of the running layer. During operation of the piston, the overlapping portion is spaced from both the piston and the cylinder.
    Type: Application
    Filed: May 12, 2021
    Publication date: November 17, 2022
    Inventors: Daniel J. Dufek, Marc Irrgeher