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:
Jan. 29, 1980
Filed:
Sep. 12, 1977
Applicant:
Inventor:
James E Nezworski, Waukesha, WI (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
236 / ; 236 / ;
Abstract
A control system for a damper installed in the exhaust flue of a furnace, by which activation of the furnace is rendered impossible unless the damper is in its fully open position. The control system achieves that objective by making completion of the energizing circuit of the solenoid that controls flow of fuel to the burner dependent upon closure of a normally open switch that is closed by the movement of the damper to its open position, and by opening the damper with an electric motor that is controlled by a relay energized in response to a call for heat at the thermostat.