Patents by Inventor John H. Cheetham

John H. Cheetham 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).

  • Strainer assembly for granular media filters
    Patent number: 4476020
    Abstract: The strainer assembly comprises a body (1) which is to be mounted in the floor (14) of the filter and which has open upper and lower ends. A hollow open ended stem (3) has an external screw-thread (4) which engages with an internal screw-thread (2) in the body. The stem projects outwardly from the body below the lower end of the body and is axially adjustable relative to the body so that the effect of filter construction errors can be eliminated. A flexible tab (11) on the stem engages with ribs (10) on the body to prevent unintentional relative rotation of the stem and body. A strainer (8) is fitted to the upper end of the body and a flow control orifice (5) is provided in the stem. The area of the orifice is smaller than the total open area of the strainer.
    Type: Grant
    Filed: November 2, 1982
    Date of Patent: October 9, 1984
    Assignee: Paterson Candy International Limited
    Inventor: John H. Cheetham