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:
Jul. 31, 1979
Filed:
Jan. 13, 1978
Robert S Bennett, Easton, CT (US);
Risdon Manufacturing Company, Torrington, CT (US);
Abstract
Each of first and second shallow hollow cylinders has a closed end and an open end, said cylinders being interconnected at their open ends with the first cylinder being disposed concentrically within the second cylinder. Each cylinder is rotatable through a selected arc with respect to the other cylinder between open and closed positions, the cylinders having cooperating structures which define a channel in the outer surface of the first cylinder which forms a circular arc and which lies in a plane perpendicular to the axes of the cylinders. The first cylinder has first and second oppositely disposed openings extending through the cylinder wall and lying in the plane of the channel, the second cylinder having a third opening extending through the cylinder wall which when the cylinders are in the open position is in registration both with the first opening and the channel and when the cylinders are in the closed position is out of registration with the first opening and the channel. The closed end of the second cylinder defines a belleville diaphragm.