Patents by Inventor John A. Holstein

John A. Holstein 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).

  • Turbine flow meter viscosity control
    Patent number: 4735227
    Abstract: A viscosity control (10, 200) is disclosed which employs a turbine flow meter (52). A pump (18) provides for a flow of solution through a conduit at a relatively constant pressure. The flow rate of the solution through the conduit thus varies depending on the viscosity of the solution. The turbine of the flow meter rotates at an angular velocity related to the flow rate. The rotational velocity of the turbine is sensed. When the turbine speed decreases as viscosity increases to a set maximum viscosity, the control supplies solvent to the solution to decrease the viscosity.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: April 5, 1988
    Assignee: Royse Manufacturing Company, Inc.
    Inventors: Edwin H. Royse, John A. Holstein