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:
Dec. 28, 1982
Filed:
Nov. 24, 1980
Applicant:
Inventors:
David C Boyer, Chicago, IL (US);
William E Ruehl, Wheeling, IL (US);
Assignee:
Illinois Tool Works Inc., Chicago, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01L / ; G08B / ;
U.S. Cl.
CPC ...
116 70 ; 116D / ; 34 89 ;
Abstract
A differential pressure signal device employing an audible vibratory reed assembly having the property of being activated automatically upon being subjected to a predetermined energy level. The assembly is preferably all plastic and includes a unique rockable flapper valve that is automatically activated when the differential in pressure between two chambers reaches a predetermined level. The opening of said valve provides a large inrush of air that activates and operates the audible vibration of said reed until the differential in pressure is lowered below said predetermined level.