Electrochemical cell

• US 3,278,408 A
• Filed: 12/19/1962
• Issued: 10/11/1966
• Est. Priority Date: 12/19/1962
• Status: Expired due to Term

• Current Assignee: Hideo Watanabe, Leonard, John E.
• Original Assignee: Hideo Watanabe, Leonard, John E.
• Inventors: Leonard, John E., HIDEO WATANABE
• Application Number:
  US04/245,869
• Time in Patent Office: 1,392 Days
• US Class Current: 204/415
• CPC Class Codes: G01N 27/28 Electrolytic cell components
• 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

Claims

1. A CELL FOR POLAROGRAPHIC ANALYSIS OF A CONSTITUENT IN A SAMPLE COMPRISING:

A PAIR OF SPACED ELECTRODES ADAPTED TO BE JOINED BY AN ELECTROLYTE, ONE OF SAID ELECTRODES BEING A SENSING ELECTRODE WITH A FORWARD END;

A FIRST MEMBRANE PERMEABLE TO SAID CONSTITUENT OVERLYING SAID FORWARD END OF SAID SENSING ELECTRODE, SAID FIRST MEMBRANE BEING SUBJECT TO APPRECIABLE COLD FLOW WHEN TENSION IS APPLIED THERETO;

A SECOND MEMBRANE OVERLYING SAID FIRST MEMBRANE AND SAID PAIR OF ELECTRODES, SAID SECOND MEMBRANE HAVING A COMPOSITION DIFFERENT FROM SAID FIRST MEMBRANE AND BEING SUBSTANTIALLY MORE PERMEABLE TO SAID CONSTITUENT THAN SAID FIRST MEMBRANE, SAID SECOND MEMBRANE BEING ELASTOMERIC AND ESSENTIALLY FREE OF COLD FLOW WHEN TENSION IS APPLIED THERETO;

CLAMPING MEANS SURROUNDING SAID ELECTRODES AND POSITIONED BEHIND SAID FORWARD END OF SAID SENSING ELECTRODE, SAID CLAMPING MEANS HOLDING SAID SECOND MEMBRANE UNDER TENSION OVER SAID FIRST MEMBRANE AND SAID SENSING ELECTRODE WHEREBY SAID FIRST MEMBRANE IS HELD IN CLOSE PROXIMITY TO SAID FORWARD END OF SAID SENSING ELECTRODE;

AND SAID MEMBRANE BEING POSITIONED ENTIRELY FORWARDLY OF SAID CLAMPING MEANS AND HAVING ITS OUTER EDGE SPACED FROM SAID CLAMPING MEANS WHEREBY SAID CLAMPING MEANS APPLIES NO TENSIION TO SAID FIRST MEMBRANE.