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. 07, 1976
Filed:
Oct. 28, 1975
Daniel C Harrington, Fridley, MN (US);
Gerald L Ahmann, St. Paul, MN (US);
John C Fox, Coon Rapids, MN (US);
Control Data Corporation, Minneapolis, MN (US);
Abstract
A temperature sensing device is disclosed in which the temperature sensing element is a semiconductor diode. The reference supply current for the diode is derived from an offset voltage regulator in such a way that power source fluctuations appear as common mode inputs to an operational amplifier. The operational amplifier controls a voltage controlled oscillator. The output pulses of the oscillator are counted over periodic time intervals of predetermined length to produce periodic counts which correlate to temperature. The device is designed in the preferred embodiment for use on commercial alternating current power lines where the length of timing for temperature sensing, the interval between readings and switching between multiple sensors is controlled by the power line frequency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile