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:
Apr. 10, 1979
Filed:
Oct. 12, 1977
Walter R Spofford, Bedford, MA (US);
P. R. Mallory & Co. Inc., Indianapolis, IN (US);
Abstract
A thermistor temperature sensing system includes a conventional comparator having a constant reference threshold voltage and a linearized thermistor sensor which in combination detect a limited range of desirable temperatures. A means is also disclosed for extending the linearization of the thermistor in a piecewise manner at at least one temperature extreme where linearity typically severely deteriorates. In a thermistor temperature sensing system, linearization of thermistor characteristics with respect to at least one temperature within the temperature extreme is achieved by utilizing circuitry which makes the threshold voltage of the conventional comparator a function of the setting of a potentiometer for a desired temperature within the temperature extreme to be sensed by a thermistor sensor. The piecewise linearization technique disclosed allows easy interface with the thermistor temperature sensing system for detection of an optimum of selectable temperatures in the extended range of linearized characteristics of the thermistor.