Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1987-08-21
1989-01-10
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
318483, 318DIG2, G01N 2707, G01R 2722
Patent
active
047976055
ABSTRACT:
A moisture sensor consists of an array of spaced apart, highly abrasion-resistant electrodes disposed on the outside surface of the windshield of a vehicle. When moisture is present, the spaces between the electrodes are bridged by the water and the output impedance of the sensor significantly decreases. This signals the presence of moisture. The electrodes have particles of a conductive metal oxide, e.g., ruthenium oxide, dispersed within a glass matrix which is fused to the windshield glass. The electrodes are formulated as an ink including particles of the metal oxide, a glass frit, and an organic binder. The ink is silk screened onto the windshield in the desired electrode pattern. After drying of the ink, the glass frit is fused to the windshield during normal heating of the windshield to shape it in a known windshield shaping (sagging) process. Novel two layer sensor arrangements, providing even greater resistance to abrasion, are also described.
REFERENCES:
patent: 2877329 (1950-05-01), Gaiser
patent: 3684569 (1972-08-01), Milgram
patent: 4109377 (1978-08-01), Blazick et al.
patent: 4554493 (1985-11-01), Armstrong
patent: 4665351 (1987-05-01), Nyberg
Delco Electronics Corporation
Eisenzopf Reinhard J.
Regan Maura K.
Wallace Robert J.
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