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. 19, 1977
Filed:
May. 05, 1975
Keith T Krueger, Bellefontaine, OH (US);
I-T-E Imperial Corporation, Spring House, PA (US);
Abstract
A pneumatic timer is constructed by stacking a calibration subassembly on top of a diaphragm housing stacked above a diaphragm subassembly, and including a filter capsule subassembly interposed between the calibration subassembly and the diaphragm housing. The filter capsule subassembly includes a check valve disposed within a recess so constructed that all air entering the recess must pass through filter screens disposed on opposite sides of the check valve. The biasing spring for the check valve bears against one of the screens and biases the movable valve member to a normal position bearing against the other screen. The second screen is flexible so that at the end of the reset stroke the plunger attached to the timing chamber diaphragm mechanically opens the check valve.