Patents by Inventor Richard W. B. Tsang

Richard W. B. Tsang 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).

  • Range hood fan with atmospheric humidity sensor
    Patent number: 5232152
    Abstract: A kitchen range hood fan electrically connectable to an atmospheric humidity sensor, such as a dehumidistat. The fan motor is automatically activated when atmospheric humidity readings measured within a dwelling exceed a pre-set limit.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: August 3, 1993
    Inventor: Richard W. B. Tsang