Patents by Inventor Daniel P. Postler

Daniel P. Postler 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).

  • Acoustically controlled electro-mechanical circulation sub
    Patent number: 4373582
    Abstract: This invention relates to a self-contained circulation sub which may be operated upon control from the surface. It may be in the shape of a short section of drill collar and utilizes a sleeve valve to cover the circulation ports. Upon reception of an acoustic signal from the surface, a control valve directs fluid from the pipe bore onto a pressure face on the sleeve valve. The sleeve valve then moves down and exposes the circulation ports thereby allowing drilling fluids to pass from its interior to its exterior.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: February 15, 1983
    Assignee: Exxon Production Research Co.
    Inventors: John M. Bednar, Daniel P. Postler, Terry V. Jones