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:
May. 28, 2002
Filed:
Nov. 06, 2000
Karl L. King, Brown Deer, WI (US);
Joseph A. Millhouse, Brown Deer, WI (US);
GLI International, Milwaukee, WI (US);
Abstract
A sensor for measuring pH of a solution includes a housing with an exterior surface for exposure to the solution. A measuring glass electrode within a tubular circuit ground electrode extends through the exterior surface. A reference glass electrode is received in a neutral pH solution in the housing and is coupled by a salt bridge to the exterior surface. An electric circuit within the housing has a first preamplifier connected by a first conductor to the measuring glass electrode and has a second preamplifier connected by a second conductor to the reference glass electrode. The first and second conductors have substantially equal lengths so that ambient electrical noise equally affects signals from the electrodes. The electrical cable that carries output signals from the electric circuit passes through a ferrite sleeve which inhibits high frequency electric noise that is induced in the cable from reaching the electric circuit.