Patents by Inventor Daniel C. Ahrns

Daniel C. Ahrns 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).

  • Multi-stage exhaust gas recirculation system
    Patent number: 4398525
    Abstract: An automotive type exhaust gas recirculation (EGR) system has two modes of operation, a first one that regulates EGR flow at a constant percentage rate as a function of throttle valve position independently of exhaust gas backpressure changes, and a second one that provides a variable percentage rate of flow of EGR gases in response to changes in exhaust gas backpressures, both modes utilizing carburetor ported vacuum modified by an air bleed device as the EGR valve opening force.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: August 16, 1983
    Assignee: Ford Motor Company
    Inventors: Daniel C. Ahrns, Shane H. Rachedi