Patents by Inventor Harold Sjostrom

Harold Sjostrom 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).

  • Patent number: 4966383
    Abstract: An extended trailer to attach to a tractor. The trailer has a main reach able to attach to a tractor. An extension reach extends rearwardly of the main reach. A bridge over the main is rigidly attached to the main reach. There is a forward self steering axle for the extended trailer. Springs extend forward from the bridge to the forward axle. The extension has an intermediate axle and rear axles. A subframe carries the intermediate and rear axles and is pivotally attached to the bridge.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: October 30, 1990
    Inventor: Harold Sjostrom