Patents by Inventor Ivor G. van Deventer

Ivor G. van Deventer 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).

  • Valve assembly
    Patent number: 4962548
    Abstract: A plumbing arrangement is described for a toilet pan connected to a waste disposal pipe. The waste pipe has an extension extending a short height above the flood level of the water trap. The upper end of the extension is closed off by a two way differential valve opening to the atmosphere. A cover is provided to permit the air flow to and from the valve but still to prevent the ingress of leaves or dirt which could have a detrimental effect upon the working of the valve. A number of embodiments of valve means are also described.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: October 16, 1990
    Assignee: G.I. Marketing CC
    Inventors: Ivor G. van Deventer, Gerrit R. C. di Somma