Patents by Inventor Donald M. Houlberg

Donald M. Houlberg 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).

  • Fluid flow meter
    Patent number: 4089220
    Abstract: A flow meter including a housing with a coaxial inlet and outlet is disclosed. The housing of the flow meter defines an inner chamber including a pair of vane assemblies surrounding the inlet and outlet. A track is defined between the vane assembly and the housing. The meter further includes a fluid responsive member positioned in the track and rotated therein by fluid flow through the meter. The rate of rotation of the member is measured by an assembly mounted on the housing.
    Type: Grant
    Filed: March 23, 1977
    Date of Patent: May 16, 1978
    Assignee: Sta-Rite Industries, Inc.
    Inventor: Donald M. Houlberg