Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-03-11
1990-05-15
Williams, Hezron E.
Communications: electrical
Condition responsive indicating system
Specific condition
340605, 73 40, G01M 316, G01N 2704
Patent
active
049261657
ABSTRACT:
Devices for detecting and obtaining information about an event, for example the presence of a liquid, which comprise (1) a swellable member which swells upon occurrence of the event and (2) a restraining member which, when the swellable member swells, restricts movement of the swellable member and thus causes the impedance of the device to change. In a preferred embodiment the device comprises two elongate conductors helically wrapped around a support core, a swellable, conductive polymer member surrounding the conductors. Occurrence of an event causes the swellable material to swell and form a conductive bridge between the conductors.
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Hauptly Paul D.
Lahlouh John
Stewart Ray F.
Wasley Robert S.
Welsh Laurence M.
Burkard Herbert G.
Raychem Corporation
Richardson Timothy H. P.
Williams Hezron E.
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