Patents by Inventor Douglas J. Miller

Douglas J. Miller 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).

  • High-temperature, high-pressure valve packing system
    Patent number: 4256317
    Abstract: Valve packing system comprising a compacted body of expanded graphite material having an apparent bulk density 1.6 to 2.0 times its apparent bulk density prior to compaction and positioned in stuffing box with zero clearance between each of valve stem and said stuffing box, and a pair of flat carbon guide rings retaining said compacted body and machined to close internal clearance with said valve stem and close external clearance with the internal walls of said stuffing box.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: March 17, 1981
    Assignee: Union Carbide Corporation
    Inventors: Marvin R. Havens, Donald R. Fields, Douglas J. Miller