Patents by Inventor Derek A. Prime

Derek A. Prime 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).

  • Excavators
    Patent number: 4293270
    Abstract: An excavator having a boom with slidably engaging base and beam parts is disclosed. The base part is mounted on a support part of the excavator for rotation about a horizontal axis; and a dipper arm which carries an excavating tool is pivotally suspended from the beam part. The base and beam parts are joined by channel section guides which permit sliding movement between the parts. A wedge member releasably fixes the relative position of the base and beam parts by wedgingly engaging both parts.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: October 6, 1981
    Assignee: J. C. Bamford Excavators Limited
    Inventor: Derek A. Prime