Oxygen sensing polarographic cell

• US 3,239,444 A
• Filed: 02/08/1962
• Issued: 03/08/1966
• Est. Priority Date: 02/08/1962
• Status: Expired due to Term

• Current Assignee: Jimmie L. Heldenbrand
• Original Assignee: Jimmie L. Heldenbrand
• Inventors: Heldenbrand, Jimmie L.
• Application Number:
  US04/171,977
• Time in Patent Office: 1,489 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

Claims

1. IN COMBINATIN:

A COVER OF INVERTED CUP SHAPE HAVING A CENTRAL APERTURE;

A BASE PLATE;

MEANS SEALINGLY FASTENING SAID BASE PLATE TO SAID COVER;

A HOLLOW FIRST ELECTRODE OF LARGE SURFACE AREA;

MEANS RESILIENTLY SUPPORTING SAID ELECTRODE ON SAID BASE PLATE WITHIN SAID COVER;

A CAP MEMBER OF INSULATING MATERIAL SUPPORTED ON SAID ELECTRODE AND HAVING A CENTRL BORE ALIGNED WITH SAID APERTURE;

AN ELECTRICALLY CONDUCINT ANNULUS HAVING A CONICAL ELECTRODE-ENGAGING SURFACE ON SAID CAP MEMBER SURROUNDING SAID BORE;

A FLEXIBLE CLOSURE MEMBER ON SAID CAP MEMBER INCLUDING A FINELY APERTURED INNER LAYER OF MATERIAL CAPABLE OF ACTING AS A SECOND ELECTRODE AND OF VERY MUCH SMALLER AREA THAN SAID FIRST ELECTRODE, AND AN OUTER LAYER SELECTIVELY PERMEABLE BY OXYGEN BUT SUBSTANTIALLY IMPERMEABLE BY AN ELECTROLYTE;

A RESILIENT SEALING RING BETWEEN SAID COVER AND SAID CAP MEMBER PRESSING SAID CLOSURE MEMBER AGAINST SAID SURFACE TO CLOSE BOTH SAID APERTURE AND SAID BORE, AND TO INSURE ELECTRICAL CONNECTION