The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1991
Filed:
Dec. 21, 1988
Sven Oldfelt, Vaxholm, SE;
Gary L Stahl, Winnebago, IL (US);
Oy Wartsila AB, Helsinki, FI;
Abstract
A vacuum toilet system comprises a waste-receiving bowl defining an interior space for receiving waste material. A sewer pipe defines an interior space that can be placed at a pressure that is lower than that in the interior space of the waste-receiving bowl, and a discharge valve is connected between the outlet of the waste-receiving bowl and the sewer pipe for controlling passage of material between the waste-receiving bowl and the sewer pipe. A rinse liquid valve controls supply of rinse liquid to the waste-receiving bowl. A controller is responsive to a user stimulus to open and close the discharge valve in accordance with a predetermined cycle, and to open the rinse liquid valve during at least the interval during which the discharge valve is being opened.