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:
Feb. 21, 1989
Filed:
Nov. 09, 1987
Applicant:
Inventors:
John M Antos, Ann Arbor, MI (US);
David B Cameron, Milford, MI (US);
Assignee:
Thetford Corporation, Ann Arbor, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137202 ; 4321 ;
Abstract
An improved vent structure for a toilet which is normally open but automatically closable depending on the water level whereby to prevent unwanted spills allows air to escape from the interior of a flush water holding tank. A cruciform shaped stem including a buoyant body attached thereto reciprocates in a bore, and a seal, provided by an interior bellows or by the buoyant body, closes the air path when the stem is buoyed upwardly by a rise in the water level.