Patents by Inventor Stanley Martin Gregerson

Stanley Martin Gregerson 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).

  • Tractor with draft load control
    Patent number: 4023622
    Abstract: A hydrostatic drive tractor having a hydraulically lowerable and raisable hitch to lower and raise an associated implement to respectively increase or decrease draft load includes a draft control system sensing increases and decreases in the hydrostatic drive pressure which are proportional to draft load as sensed by the drive wheels to activate valving to respectively raise and lower the hitch.
    Type: Grant
    Filed: September 15, 1975
    Date of Patent: May 17, 1977
    Assignee: Deere & Company
    Inventor: Stanley Martin Gregerson