Ronnie L Pratt

US Patent:

55085091, Apr 16, 1996

Filed:

Nov 30, 1993

Appl. No.:

8/159799

Inventors:

Masao Yafuso - Lake Forest CA
Ronnie L. Pratt - Hammond WI
Kathryn R. Bretscher - Shoreview MN
Kenneth B. Wood - St. Paul MN
John L. Dektar - Laguna Hills CA
James G. Bentsen - North St. Paul MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

G01N 3350

US Classification:

250216

Abstract:

Sensing elements, useful in sensing the concentration of a gas, e. g. , carbon dioxide, in a medium, e. g. blood, and methods for making such sensing elements are disclosed. In one embodiment, the method comprises continuously placing a sensing composition precursor in contact with a continuous web, forming a continuous sensing composition from the precursor, and applying a continuous opaque film to the sensing composition. A plurality of individual sensing elements are formed from this composite structure. These sensing elements, which each have very similar sensing characteristics, are placed in a sensor fixture for use.