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:
Sep. 14, 1976
Filed:
Nov. 08, 1974
Stuart L Gallant, Minneapolis, MN (US);
Louis C Cosentino, Wayzata, MN (US);
Renal Systems, Inc., Minneapolis, MN (US);
Abstract
An improved portable conductivity meter for automatically and rapidly drawing an electrolyte sample and for measuring and providing an accurate output indication of its electrical conductivity, which is independent of temperature variations of the electrolyte. A pen-like dip probe, housing an electrode pair and a thermistor in unique configuration, is designed to rapidly draw an electrolytic dialysate sample whenever the probe is immersed within the electrolyte. A high frequency AC source drives a balanced active measurement circuit, having a reference leg and a measurement leg which contains the electrode pair and the temperature compensating thermistor. The balanced circuit provides measurement and reference output signals of opposite polarity to a summing amplifier which drives a visual conductivity indicator.