Patents by Inventor Thomas J. Ziska

Thomas J. Ziska 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).

  • Sewer line detection system
    Patent number: 4911012
    Abstract: A system for detecting the location of an underground portion of a sewer line. A vibration or sound of a predetermined frequency is introduced into an accessible (e.g., above ground) portion of the sewer line. The vibration is allowed to propagate through the sewer line and into the underground portion of the sewer line. The location of the underground portion of the sewer is identified by sensing the vibration by means of a detector located at the ground surface or in an inserted "in ground" device above the underground portion of the sewer line.
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: March 27, 1990
    Inventor: Thomas J. Ziska