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:
Oct. 16, 1990
Filed:
Sep. 01, 1988
John L Erdman, Eden Prairie, MN (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
A control circuit for controlling the ignition time of a control system for a gas-fired combustion air heating appliance comprising a set of potentiometers and a controller for detecting failures in the control circuit. The set of potentiometers are used together to select the ignition time of the control system. The potentiometers are set to produce analog input signals which, when converted to digital signals, have a predetermined complementary relationship (such as one's or two's complement). The controller is connected to the set of potentiometers and includes an analog-to-digital converter which receives the analog input signals from the set of potentiometers and converts them into digital signals. The controller compares or analyzes the digital signals derived from the first and second potentiometers to detect failures in the control circuit and halts operation of the control system if the digital signals do not have the predetermined complementary relationship.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile