Patents Represented by Attorney Marvin E. Eickenroht

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  • Well drilling tool
    Patent number: RE30257
    Abstract: There are disclosed several embodiments of a well tool which is adapted to be connected as part of a pipe string through which drilling fluid is circulated, and which comprises inner and outer members which are rotated with respect to one another by a motor between them.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: April 22, 1980
    Assignee: Engineering Enterprises, Inc.
    Inventor: Fred K. Fox