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:
Nov. 24, 1987
Filed:
Dec. 07, 1984
John E Cook, Chatham, CA;
Canadian Fram Limited, Chatham, CA;
Abstract
A variable flow rate valve (10) comprising; a housing (12) defining a vacuum chamber (35) and a flexible diaphragm (50) secured to said housing (12). The diaphragm defines one extreme of the pressure chamber (35) and is movable in one direction in response to decreases in the pressure within the pressure chamber and movable in an opposite direction in response to increases in the pressure within the pressure chamber. The valve (10) further includes means (40, 100, 110, 112) for providing a mechanical position limit or stop for the diaphragm in the one direction and means (126, 84, 86, 92, 94) for selectively varying the pressure within the pressure chamber for causing the diaphragm to move in response to the pressure differential thereacross.