Patents Represented by Attorney Alonzo DeCell

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  • Heavy wall drill pipe and method of manufacture of heavy wall drill pipe
    Patent number: 4771811
    Abstract: A substantially homogeneous heavy wall drill pipe and its method of manufacture are disclosed. A cylindrical ingot is placed in a multi-hammer forging press to form the ingot into a drill pipe bar having a central protector portion and upper and lower connector sections each of larger diameter than cylindrical body sections of the drill pipe. Thereafter, the bar is straightened and upper and lower end connectors are machined. Threaded end portions are machined on the connectors and a bore is drilled through the drill pipe bar.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: September 20, 1988
    Assignee: Lor, Inc.
    Inventors: Alonzo L. DeCell, Gregg S. Perkin, Peter Patarini