Patents by Inventor Paul B. Lee

Paul B. Lee 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).

  • Downhole valve for oil/gas well
    Patent number: 5499687
    Abstract: A downhole drilling device utilizing a spring-loaded sleeve within a casing for controlling circulation of fluid material. A plastic, i.e., deformable ball is used to block a flow opening in the sleeve for positioning the sleeve and aligning flow ports. Subsequently, the ball is deformed and the drilling operation continues. In one form, an expandable packer may be operated to close off the annulus about the casing.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: March 19, 1996
    Inventor: Paul B. Lee
  • Downhole valve for use when drilling an oil or gas well
    Patent number: 4889199
    Abstract: A downhole drilling device utilizing a spring-loaded sleeve within the casing for controlling circulation of fluid material. A plastic, i.e., deformable ball is used to block a flow opening in the sleeve for positioning the sleeve and aligning flow ports. Subsequently, the ball is deformed and the drilling operation continues. In one form, an expandable packer may be operated to close off the annulus about the casing.
    Type: Grant
    Filed: May 27, 1987
    Date of Patent: December 26, 1989
    Inventor: Paul B. Lee