Patents by Inventor Norman D. Esau

Norman D. Esau 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).

  • Method and apparatus for detecting the level of a liquid in a tank
    Patent number: 4747062
    Abstract: The present invention provides for a process and apparatus for detecting the level of a liquid in a vessel. The method involves sensing the pressure head of the liquid level in column disposed with the vessel wherein the column liquid level has been adjusted to a first predetermined level. The level in the column is then adjusted to a second predetermined level. The pressure head of the second predetermined level in the column then sensed. The pressure of the liquid head in the vessel outside the column is sensed. The three pressure values are then used to determine the liquid level in the vessel.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: May 24, 1988
    Assignee: Amoco Corporation
    Inventor: Norman D. Esau
  • Flow indicator for a fuel dispenser
    Patent number: D305209
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: December 26, 1989
    Assignee: Amoco Corporation
    Inventor: Norman D. Esau
  • Flow indicator for a fuel dispenser
    Patent number: D315526
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventor: Norman D. Esau