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. 20, 2004
Filed:
Apr. 04, 2001
Applicant:
Inventors:
Anthony W. Abraham, Laguna Nigel, CA (US);
Dwain Moore, Fort Collins, CO (US);
John Paisley, Waterloo, CA;
Xiangsheng Wang, Guelph, CA;
Assignee:
The Water Heater Industry Joint Research and Development Consortium, Rio Verde, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F22B 3/742 ;
U.S. Cl.
CPC ...
F22B 3/742 ;
Abstract
A safety device for shutting off the flow of gas to a gas-fired appliance in the presence of flammable vapors. The resistance of a variable resistance flammable vapor sensor is monitored by a microprocessor that controls the operation of a gas flow valve. When the measured resistance indicates the presence of a preselected concentration of flammable vapors, the gas flow valve is shut of and the ignition system cannot be energized.