Patents by Inventor Raymond Ernest Bowles

Raymond Ernest Bowles 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).

  • Drill
    Patent number: 3955633
    Abstract: A drill in which a drilling apparatus is releasably mounted on the bottom of a drill string and on release can be withdrawn upwardly through the drill string by wire-line. The main cutting bit is disposed on the bottom end of the removable apparatus and the apparatus includes expandable cutters disposed above the main cutting bit to ream the hole cut by the main bit to permit the drill string to follow down the hole. The cutters are retracted for withdrawal of the apparatus.
    Type: Grant
    Filed: April 26, 1974
    Date of Patent: May 11, 1976
    Assignee: Mindrill Limited
    Inventor: Raymond Ernest Bowles