Patents by Inventor Carl A. Keyzer

Carl A. Keyzer 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).

  • Engine air heater and starting circuits to by-pass auxiliary steering circuit
    Patent number: 4129001
    Abstract: An electric control circuit for use in the ignition system of a vehicle having a vehicle battery powered auxiliary steering system which is energized upon engine failure or shutdown during vehicle operation. The ignition circuit disconnects the auxiliary steering system from the vehicle battery during heating of the pre-start intake air and during starting of the engine to eliminate unnecessary drain on the vehicle battery.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: December 12, 1978
    Assignee: Fiat-Allis Construction Machinery, Inc.
    Inventor: Carl A. Keyzer
  • Vehicle starting circuit to by-pass auxiliary steering system
    Patent number: 4079806
    Abstract: An electric circuit for use in the ignition system of a vehicle having an auxiliary steering system powered by the vehicle battery which is energized upon engine failure or shut down during vehicle operation. The ignition circuit disconnects the auxiliary steering system from the vehicle battery during engine starting to eliminate unnecessary drain on the vehicle battery.
    Type: Grant
    Filed: December 17, 1976
    Date of Patent: March 21, 1978
    Assignee: Fiat-Allis Construction Machinery, Inc.
    Inventors: Peter J. Hoag, Carl A. Keyzer, Michael W. Steffens