Patents by Inventor Morris Polis

Morris Polis 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).

  • Automatic antifreeze back-up valve for sewer
    Patent number: 5144975
    Abstract: A back-up butterfly valve installed in a sewer pipe which will automatically close when sewage water back flows due to heavy rains thereby preventing sewage-laden liquids in the lower levels of residential homes and commercial buildings. The valve is motor actuated and is controlled by a liquid sensor disposed downstream. A clock is utilized to actuate a system by which the valve is opened and closed periodically preventing the valve from sticking or freezing which would leave the valve inoperative.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: September 8, 1992
    Inventor: Morris Polis