Patents by Inventor David W. Rietman

David W. Rietman 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).

  • Multiple section mast with a pair of lift jacks behind the primary section uprights
    Patent number: 4369861
    Abstract: A pair of three-element, constant speed lift jacks are positioned at the rear of the stationary mast section uprights above the tilt jack connections with the same uprights, thus permitting the mast to be close-coupled to the front of a counterbalanced lift truck. The support for the lower ends of the lift jacks, at the rear of the primary uprights, are reinforced by the pivot brackets for the tilt jacks and also by an intermediate cross tie between the primary uprights.
    Type: Grant
    Filed: November 10, 1980
    Date of Patent: January 25, 1983
    Assignee: Allis-Chalmers Corporation
    Inventor: David W. Rietman