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. 05, 1980
Filed:
Feb. 27, 1979
Gerard Marotel, Sartrouville, FR;
Compagnie d'Electronique et de Piezoelectricite C.E.P.E., Sartrouville, FR;
Abstract
Temperature regulating apparatus for the control of temperature within an enclosure including a temperature measuring circuit which measures the temperature within the enclosure and a semiconductor heating circuit for generating heat responsive to the temperature measuring circuit. The temperature measuring circuit includes a resistive bridge with a temperature sensitive element as one of its legs, the output of the bridge being coupled to an amplifier for developing a temperature signal which varies as a function of the temperature within the enclosure. The heating circuit includes a plurality of transistors having their respective collector-emitter paths coupled in series so that a heating current can flow through the collector-emitter paths of all of the transistors. One of the transistors, designated the control transistor, has its base coupled to the output of the amplifier for controlling the heating current by the temperature signal. A current limiting circuit may be included in a feedback path around the control transistor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile