Patents Represented by Attorney Matthews, Joseph, Shaodox, Mason

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  • Anti-rotational cementing apparatus
    Patent number: 5842517
    Abstract: The apparatus of the present invention is a mechanism for use in cementing a casing string in a well bore comprising a float collar connectable to the casing string, a cement plug engagable to the float collar, and a wiper plug engagable to the cement plug, each element utilizing inclined plane J-slots for engagability. When engaged, the J-slots disallow not only rotational movement between the elements, but also vertical movement between the elements.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: December 1, 1998
    Assignee: Davis-Lynch, Inc.
    Inventor: Malcolm G. Coone