Patents by Inventor June Willson

June Willson 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).

  • Vent stack screen for portable toilet holding tanks
    Patent number: 6735790
    Abstract: A vent stack screen for portable toilet holding tanks is provided in the form of a cap designed to fit over the open end of an open air vent stack extending from the holding tank through the roof of a portable toilet. The cap is constructed from a tubular sleeve of plastic material having an inner diameter substantially equal to the outer diameter of the vent stack of a holding tank. The cap includes an inwardly extending annular lip formed at one end. A circular mesh of plastic screen material is secured within the tubular sleeve between the annular lip and a plastic locking ring received within the tubular sleeve.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: May 18, 2004
    Inventors: Donald V. Willson, June Willson