초록 ▼

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 t

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.

대표청구항 ▼

A device for detecting an event comprising: (i) first and second conductive members which, in the absence of an event, are electrically insulated from each other, (ii) a separator which has apertures passing therethrough, and (iii) a swellable member which swells upon occurrence of the event, and on

A device for detecting an event comprising: (i) first and second conductive members which, in the absence of an event, are electrically insulated from each other, (ii) a separator which has apertures passing therethrough, and (iii) a swellable member which swells upon occurrence of the event, and on swelling causes an electrical path to be formed between the conductive members, through the apertures of the separator.