Patents by Inventor Chang Tsan-Yun

Chang Tsan-Yun 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).

  • Exhaust cleaner for filter hoods
    Patent number: 5358540
    Abstract: An exhaust cleaner includes a water trough installed in the exhaust piping of a filter hood through which exhaust gas from the filter hood passes, a water heater controlled to heat water in the water trough, a chemical detergent added in water in the water trough, a waste grease collector disposed outside the water trough to collect solid suspension particles from the water trough.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: October 25, 1994
    Inventors: Chang Tsan-Yun, Chen-Shing Wu