Patents by Inventor Roy D. Lister

Roy D. Lister 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).

  • Patent number: 8955691
    Abstract: The invention comprises a hydrocyclone separator which includes a first segment including a fluid inlet, an overflow outlet and a spiral fluid ramp having a first and second end. The first end of the spiral fluid ramp is in fluid communication with and extends from the fluid inlet. The second end of the spiral fluid ramp is connected in fluid communication with the wider end of a frustoconical second segment and the narrower end of the frustoconical second segment is connected in fluid communication with a first end of a third segment comprising a tubular element. An underflow outlet is located at the second end of said tubular element.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: February 17, 2015
    Inventor: Roy D. Lister
  • Publication number: 20130048556
    Abstract: The invention comprises a hydrocyclone separator which includes a first segment including a fluid inlet, an overflow outlet and a spiral fluid ramp having a first and second end. The first end of the spiral fluid ramp is in fluid communication with and extends from the fluid inlet. The second end of the spiral fluid ramp is connected in fluid communication with the wider end of a frustoconical second segment and the narrower end of the frustoconical second segment is connected in fluid communication with a first end of a third segment comprising a tubular element.
    Type: Application
    Filed: December 22, 2011
    Publication date: February 28, 2013
    Inventor: Roy D. Lister
  • Publication number: 20030221558
    Abstract: Cyclone separator apparatus for separating a gaseous mixture of a at least two respectively lighter and heavier gases. The apparatus includes a first tubular section and an elongated tubular section adjoined to the first section, which converges at a constant angle. A gaseous mixture is flowed into the interior of the first section to achieve cyclonic rotation of the mixture, the rate of which increases with the convergence at the conical section, thereby effecting separation of the lighter and heavier gas components. A lighter gas outlet is connected to the interior of the apparatus for withdrawing the lighter gas from the axial portions of the cyclone, and a heavier gas outlet is connected to the interior of the apparatus at the converged end of the conical section for withdrawing the heavier gas which the cyclonic action moves radially and which then moves toward the outlet due to a pressure drop in the apparatus.
    Type: Application
    Filed: March 25, 2003
    Publication date: December 4, 2003
    Inventors: Roy D. Lister, Albert K. Solcher
  • Patent number: 5185087
    Abstract: Apparatus for concentrating and deodorizing ruminant waste effluent. The effluent is passed thru a hydrocyclone. The conentrated, deodorized solids waste is suitable for disposal or can be further processed to turn it into fertilizer. The cleaned water can be discarded or reused.
    Type: Grant
    Filed: April 19, 1991
    Date of Patent: February 9, 1993
    Inventors: Roy D. Lister, Sabino Cortez
  • Patent number: 4857197
    Abstract: A liquid separator is disclosed for separating a liquid mixture into first and second liquids of different densities. The liquid separator includes a substantially conical chamber having a closed upper portion with a liquid mixture inlet therein. A first liquid collecting mechanism is provided in a lower portion of the conical chamber for collecting and removing a first separated liquid, and a second liquid collecting device surrounds the opening in the lower portion of the conical chamber for collecting and removing a second separated liquid. A return conduit mechanism is provided for returning a portion of the second separated liquid tangentially into an upper portion of the conical chamber to act as a drive fluid to cause the centrally introduced liquid mixture to rotate for effective and efficient separation.
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: August 15, 1989
    Assignee: Amoco Corporation
    Inventors: Grant A. Young, Roy D. Lister, William D. Wakley, Steven L. Andrews
  • Patent number: 4818400
    Abstract: Apparatus for dewatering. The effluent to be dewatered is passed through a hydrocyclone. The underflow of the hydrocyclone is confirned by a shroud to convert horizontal components of spray into vertical components. The effluent is driven forcibly vertically onto an endless driven filter belt.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: April 4, 1989
    Assignee: Eagle-Picher Industries, Inc.
    Inventors: Robert G. Russell, Roy D. Lister
  • Patent number: 4786412
    Abstract: A hydrocyclone has a lower conical separating chamber with a lower outlet and a tube in the outlet projecting into the concial chamber to reduce the water content of the materials discharged from the lower outlet.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: November 22, 1988
    Assignee: Eagle-Picher Industries, Inc.
    Inventors: Roy D. Lister, Tommy J. Derrington
  • Patent number: 4765887
    Abstract: A hydrocyclone separator has a central feed section, an upper vortex finder, and a lower conical section. A spigot and socket connection is provided to join the sections. Each spigot has a groove and each socket has a bead that mates with the groove. A band surrounds each connection and clamps them together to form a leak-tight connection.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: August 23, 1988
    Assignee: Eagle-Picher Industries, Inc.
    Inventor: Roy D. Lister
  • Patent number: 4324438
    Abstract: A bushing for the deck of drilling rig in which slowly rotating drilling pipe (drill string) move downwardly to form a bore in the earth. The bushing includes an outer shell, an inner shell mounted for rotation within the outer shell and an elastomeric bushing mounted within the inner shell for rotation therewith. The bushing is formed of a plurality of arcuate segments which are snugly fitted against the drilling pipe by a garter spring which allows for limited expansion of the segments with respect to each other to accommodate pipe of differing diameters. The end portions of the segments overlap one another so that as the bushing is expanded, a seal against dust and fluids is maintained.
    Type: Grant
    Filed: November 13, 1980
    Date of Patent: April 13, 1982
    Assignee: Eagle-Picher Industries, Inc.
    Inventor: Roy D. Lister