Electrolytic sensor with anodic depolarization

• US 3,380,905 A
• Filed: 10/11/1963
• Issued: 04/30/1968
• Est. Priority Date: 10/11/1963
• Status: Expired due to Term

• Current Assignee: Leland C. Clark Jr
• Original Assignee: Leland C. Clark Jr
• Inventors: Clark, Leland C. Jr.
• Application Number:
  US04/315,461
• Time in Patent Office: 1,663 Days
• US Class Current: 204/415
• CPC Class Codes: G01N 27/404 Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid , e.g. Clark-type oxygen sensors
• CPC Class Codes: G01N 27/48 using polarography, i.e. measuring changes in current under a slowly-varying voltage

Claims

1. A CELL FOR USE IN POLAROGRAPHIC ANALYSIS COMPRISING THE COMBINATION OF:

AN ANODE AND A CATHODE ELECTRODE, MEANS FOR MAINTAINING SAID ELECTRODES IN SPACED RELATIONSHIP, MEMBRANE MEANS SELECTIVELY PERMEABLE TO THE CONSTITUENT TO BE MEASURED, MEANS MOUNTING SAID MEMBRANE IN SPACED RELATIONSHIP TO SAID ELECTRODES TO DEFINE A SPACE BETWEEN SAID ELECTRODES AND SAID MEMBRANE, EACH OF SAID ELECTRODES INCLUDING AN ACTIVE SURFACE POSITIONED ON THE SAME SIDE OF SAID MEMBRANE AND EXPOSED TO THE CONSTITUENT TO BE MEASURED AS THE LATTER PASSES THROUGH SAID MEMBRANE, SAID ANODE BEING OF A MATERIAL WHICH IS POLARIZABLE IN THE PRESENCE OF AN ELECTROLYTE, AN ELECTROLYTE IN AT LEAST A PORTION OF SAID SPACE CONTACTING EACH ELECTRODE FOR FORMING AN ELECTRICAL PATH THEREBETWEEN, SAID ELECTROLYTE INCLUDING A MATERIAL WHICH IS INEFFECTIVE TO DEPOLARIZE SAID CATHODE ELECTRODE AND CAPABLE OF DEPOLARIZING SAID ANODE ELECTRODE AT A RELATIVELY LOW VOLTAGE, AND SAID CATHODE ELECTRODE BEING DEPOLARIZED BY SAID CONSTITUENT BEING MEASURED.