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:
Jun. 07, 1977
Filed:
Jan. 09, 1976
Applicant:
Inventor:
Horace A Teass, Jr, Pleasantville, NY (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
324 / ; 2041 / ;
Abstract
A circuit for monitoring the conductivity of a solution has a four probe conductivity cell which is supplied by a constant current source to provide a signal proportional to the conductivity. A thermistor is connected in the feedback circuit of an operational amplifier and responds to temperature changes in the solution to change the gain of the amplifier and maintain the circuit output at a predetermined level.