Patents by Inventor John I. Henn

John I. Henn 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).

  • Hydrostatic front wheel drive system
    Patent number: 4183419
    Abstract: A motor grader is provided with an electrical control circuit for automatically effecting engagement, speed, and direction control of an auxiliary hydrostatic front wheel drive system to augment the primary engine-driven rear wheel drive system.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: January 15, 1980
    Assignee: Deere & Company
    Inventors: John I. Henn, Donald K. Pfundstein
  • Hydrostatic front wheel drive system
    Patent number: 4177870
    Abstract: A motor grader is provided with an electrical control circuit for automatically effecting engagement, speed, and direction control of an auxiliary hydrostatic front wheel drive system to augment the primary engine-driven rear wheel drive system.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: December 11, 1979
    Assignee: Deere & Company
    Inventor: John I. Henn