Patents by Inventor Derrek Drury

Derrek Drury 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).

  • Select-fire pressure relief subassembly for a chemical cutter
    Patent number: 6702009
    Abstract: A downhole chemical cutter (12) has first and second passages (124, 126) which extend parallel, in fluid communication with an interior passage (32). A first ignitor (210) in the first passage (124) ignites a propellant (34) in the interior passage (32) to dispense a cutting chemical (46). The second passage (126) extends from the interior passage (32) to an exterior of the chemical cutter (12), and is sealed by members (176, 156). After the first ignitor (210) is fired, the second ignitor (218) is fired to push the members (176, 156) from sealing the second ignitor passage (126), such that the interior passage (32) is in fluid communication with the exterior of the chemical cutter (12). A control circuit (252) has two diodes (106, 110) connected in parallel and configured for passing current of opposite polarity to respective ones of the first and second ignitors (210, 218).
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: March 9, 2004
    Assignee: Diamondback Industries, Inc.
    Inventors: Derrek Drury, Robert C. Andres