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:
Feb. 10, 1976
Filed:
Aug. 27, 1974
David C Hamstra, Clinton, IA (US);
General Electric Company, Fort Wayne, IN (US);
Abstract
A control system for controlling a condition, such as temperature, to maintain that condition in a generally enclosed space near a selected condition value. The system has a condition responsive impedance in series with a selectable impedance across a regulated voltage source to provide a voltage divider network, the output of which reflects the instantaneous condition of the environmental space relative to a selected condition therefor. This output is supplied to a Schmitt trigger circuit having hysteresis characteristics sufficient to provide a stable operating mode for the control system, and the Schmitt trigger circuit output controls a means for changing the condition of the enclosed space. A manual mode selecting switch may be provided for inserting any of several different impedances in the series combination, and a timer may be provided to automatically switch between different impedances in the series combination as determined by elapsed time with respect to application of power to the circuit.