Patents by Inventor Robert O. Andreasen

Robert O. Andreasen 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).

  • Ring for a manhole cover
    Patent number: D319883
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: September 10, 1991
    Assignee: Universal Valve Company, Inc.
    Inventors: Martin C. Pettesch, Robert O. Andreasen