Patents by Inventor Thomas F. Cole

Thomas F. Cole 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).

  • Hydraulic depth indicator for hydraulic drilling machines
    Patent number: 4339946
    Abstract: A hydraulically operated earth boring machine, improved with a flowmeter and indicator to show the instantaneous and the greatest depth of the drilling tool.
    Type: Grant
    Filed: December 5, 1979
    Date of Patent: July 20, 1982
    Assignee: Hughes Tool Company
    Inventor: Thomas F. Cole