Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-03-09
1984-11-20
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
73776, G01R 3102, G01R 3112
Patent
active
044841329
ABSTRACT:
A crack or rupture-detecting system comprising an electrically-insulating substrate which carries lines of electrically-conducting material formed of small electrically conductive particles which are in electrical contact. The substrate layer may be elastomeric when applied to the object to be protected, but later will crack or rupture if a crack or rupture occurs in the object and layer and thereby separate the particles in the conducting line or lines adjacent the crack or rupture.
REFERENCES:
patent: 3603142 (1971-09-01), Saylak
patent: 3721898 (1973-03-01), Dragoumis
patent: 3803485 (1974-04-01), Crites
patent: 4255974 (1981-03-01), Dufrane
Krawczewicz Stanley T.
Miller William V.
Solis Jose M.
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