Title: Portable toilet with vent means for the holding tank

Abstract: Apparatus for venting a sealed holding tank of a portable toilet to equalize the atmosphere and tank pressures before opening and closing the inlet port of the holding tank, said holding tank including a valve assembly for opening and closing the inlet port of the tank, and a vent port means in the tank associated with the valve assembly so that when the valve assembly is moved toward its open position, the vent means will be opened immediately prior to opening of the inlet port and when the valve assembly is moved toward its closed position, the vent port will be closed immediately after closing of the inlet port.

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Inventors: Sargent, Frank T. (Ann Arbor, MI, US)
Antos, John M. (Ann Arbor, MI, US)
Lindsay, Erin J. (Ann Arbor, MI, US)

Application Number: 892762
Filing Date: 1978-04-03
Publication_date: 1979-03-27
Assignee: Thetford Corporation (Ann Arbor, MI)
Primary Class(es): 4/321 4/347, 4/434
Other Classes:
US Patent Ref:

3551916	Jan, 1971	Reid	4/347.
3570018	Mar, 1971	Sargent et al.	4/115.
3747130	Jul, 1973	Sargent et al.	4/321.
3801991	Apr, 1974	Fulton et al.	4/321.
3851339	Dec, 1974	Flinner et al.	4/321.
3949430	Apr, 1976	Miller et al.	4/321.
4032996	Jul, 1977	Sargent et al.	4/441.

Other Refs:
Primary Examiner: Artis, Henry K.
Assistant Examiner:
Attorney: Olsen & Stephenson