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. 01, 2003
Filed:
Jan. 09, 2002
Prasad S. Khadkikar, Seville, OH (US);
Richard L. Gerich, Mansfield, OH (US);
Christine M. Hudson, Hudson, OH (US);
Jeffrey A. West, Bellville, OH (US);
Derek J. Rose, Mansfield, OH (US);
Douglas J. Kempf, Mansfield, OH (US);
Douglas E. Prather, Jackson, MI (US);
Richard E. Welch, Lexington, OH (US);
Therm-O-Disc, Incorporated, Mansfield, OH (US);
Abstract
An improved flue pipe construction particularly adapted for a fuel fired water heater is disclosed which serves to reduce or minimize heat loss when the water heater is in a standby mode. The flue pipe construction comprises inner and outer concentric flue pipes which define an air space therebetween and one or more valve arrangements associated therewith to selectively restrict air flow through such air space. The valve arrangements include a thermally responsive actuator operative to open and close the valve member in response to heat generated by firing of the burner assembly without the need for any external power supply or interlocks.