Patents by Inventor Stephan C. Schroeder

Stephan C. Schroeder 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).

  • Thickness measurement of in-ground culverts
    Patent number: 5929338
    Abstract: A system which enables the user to measure continuously or intermittently or by remote command the thickness changes, above or below the water, under variable temperature changes of underground culverts with reliability. A liquid delay is used to couple the sound to the culvert comprising a focused transducer (10) screwed into a hollow cone-like structure called a "squirter" or "bubbler" (11) providing the operator of the system a means for searching for good echoes from which calculations of thickness with a computer can be made using the known velocity and echo return times.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: July 27, 1999
    Assignee: The United States of America, as represented by the Secretary of the Army.
    Inventors: Julius Frankel, Agostino Abbate, Stephan C. Schroeder