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. 13, 1994
Filed:
Jul. 23, 1993
Robert C Swilik, Jr, Indianapolis, IN (US);
Mark T Whitaker, Greenwood, IN (US);
Other;
Abstract
There is disclosed a modification in the control circuitry of a gas furnace having a primary or main limit whereby the primary circuit subsumes the functions of a the secondary or manual reset limit circuit. The control circuit incorporates a microprocessor capable of sensing conditions in the furnace, enabling and disabling the various furnace components. When an overtemperature condition is sensed the furnace is thereupon disabled by a process that executes in the microprocessor and comprises the repeated steps of: sensing if the limit switch is open; determining, in the event that the limit switch is open, whether the limit switch remains open for a period that exceeds a predetermined time interval; incrementing a cycle count in the event that the limit switch has remained open for the predetermined time period; waiting for the limit switch to reset in the event that the incremented cycle count does not exceed a predetermined value, and reinitiating the combustion cycle if the step of waiting was performed; and disabling the furnace in the event that the incremented cycle count exceeds the predetermined value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile