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:
Aug. 17, 1976
Filed:
Jul. 28, 1975
Robert L Baysinger, St. Louis, MO (US);
Harry E Newport, Jr, Crestwood, MO (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A spark ignition circuit begins producing sparking pulses and a storage capacitor begins charging upon closure of a space thermostat. An electromagnetically operated valve controlling gas flow to a burner is energized sufficiently to open only upon discharge of the capacitor and a parallel holding circuit holds open the valve and prevents recharging of the capacitor. A counting circuit, including a first monostable multivibrator, responds to each sparking pulse to effect incremental charging of a capacitor. Circuit means, including a programmable unijunction transistor and a second monostable multivibrator, responds to each occurrence of a predetermined charge on the capacitor to produce an output pulse comprising negative and positive signal voltages occurring in that order. Switching means responding to the positive signal of the first occurring output pulse effects the discharge of the storage capacitor and completion of the holding circuit, whereby the valve is open. If timely ignition occurs, means responding to burner flame cuts off igniter operation. If ignition does not occur within the following counting period, the switching means responds to the negative signal of the succeeding output pulse to break the valve holding circuit.