Patents by Inventor Steven W. Campbell

Steven W. Campbell 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).

  • Coriolis mass flow rate meter having means for modifying angular velocity gradient positioned within a conduit
    Patent number: 5576500
    Abstract: A flow meter apparatus for measuring attributes of a fluid using the Coriolis principle is disclosed. The apparatus comprises (1) a body capable of being inserted into and surrounded by the fluid, (2) an actuator, disposed within the body, for vibrating a surface of the body in a radial mode of vibration, the vibrating surface developing Coriolis forces within the fluid, (3) a detector, coupled to the surface, for measuring motion of the surface, the motion being a function of Coriolis forces developed in the fluid and (4) a circuit, coupled to the measuring detector, for determining an attribute of the fluid as a function of the motion of the surface. In a preferred embodiment of the invention, a conduit surrounds the apparatus and is coupled to the detector. The apparatus allows precise detection of mass flow rate, pressure, density and viscosity of the fluid surrounding the apparatus.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: November 19, 1996
    Assignee: Direct Measurement Corporation
    Inventors: Donald R. Cage, Steven W. Campbell, David T. Hahn
  • Coriolis mass flow rate meter
    Patent number: 5448921
    Abstract: A flow meter apparatus for measuring attributes of a fluid using the Coriolis principle is disclosed. The apparatus comprises (1) a body capable of being inserted into and surrounded by the fluid, (2) an actuator, disposed within the body, for vibrating a surface of the body in a radial mode of vibration, the vibrating surface developing Coriolis forces within the fluid, (3) a detector, coupled to the surface, for measuring motion of the surface, the motion being a function of Coriolis forces developed in the fluid and (4) a circuit, coupled to the measuring detector, for determining an attribute of the fluid as a function of the motion of the surface. In a preferred embodiment of the invention, a conduit surrounds the apparatus and is coupled to the detector. The apparatus allows precise detection of mass flow rate, pressure, density and viscosity of the fluid surrounding the apparatus.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: September 12, 1995
    Assignee: Direct Measurement Corporation
    Inventors: Donald R. Cage, Steven W. Campbell, David T. Hahn