Patents by Inventor Clyde N. Preston

Clyde N. Preston 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).

  • Combination tubing cutter and releasing overshot
    Patent number: 4883118
    Abstract: A mechanical tubing cutter for severing and retrieving fish from wells comprises a slip body for clamping the upper end of the fish, and cam-actuated cutter knives for severing the fish below the slip body. The clamping and cutting operations occur in an automatic and predictable sequence as upward force is progressively applied to the tool. The tool may be used as a releasing overshot merely by substituting a slip body setting sleeve for the cutter knives.
    Type: Grant
    Filed: November 17, 1988
    Date of Patent: November 28, 1989
    Inventor: Clyde N. Preston