Patents by Inventor Leroy E. Bartholomew

Leroy E. Bartholomew 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).

  • Blowout preventer with removable packer
    Patent number: 5333832
    Abstract: An improved ram-type blowout preventer having an improved resilient ram packer which includes an upper retainer plate and a lower retainer plate which each have a front face with a central recess therein, a back and sides, resilient end elements bonded between the plates at the sides and having facing surfaces extending from front to back and a resilient insert shaped to be positioned between said plates and between said end elements with sides mating with the shape of the facing surfaces of the end elements.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: August 2, 1994
    Inventors: Leroy E. Bartholomew, Eric G. Childs, David M. Callahan