Patents by Inventor Ralph O. Erlandson

Ralph O. Erlandson 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).

  • Seal integrity tester and method
    Patent number: 4901558
    Abstract: The present invention is a method and apparatus for testing filled containers. The apparatus includes both a vacuum sensor and displacement sensors in combination. A computer is utilized to analyze the data from both the vacuum sensor and the displacement sensors, and based on preselected criteria, determines the seal integrity for the container.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: February 20, 1990
    Assignee: Geo A. Hormel & Co.
    Inventors: Lyndon R. Leining, Eric S. Vandenberg, Ralph O. Erlandson