Patents by Inventor Darrell J. Ulch

Darrell J. Ulch 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).

  • Adjustment means for roll crushers with gas hydraulic springs
    Patent number: 3938732
    Abstract: A roll crusher incorporates gas hydraulic springs to maintain the desired spacing between the crushing rolls and to provide overload protection. Featured are separate hydraulic means for backing off and then reapplying the hydraulic springs by altering their overall lengths so that roll spacing can be readily adjusted.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: February 17, 1976
    Assignee: Iowa Manufacturing Company
    Inventors: Vernon L. Schrimper, Floyd A. Lillig, Darrell J. Ulch