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Electrochemical Timing Switch

IP.com Disclosure Number: IPCOM000042763D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04

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Finch, WF [+details]


This switch is an electrical device which has a high resistance between its two terminals (1012 ohms or greater) in its initial state, as fabricated. Upon application of a potential difference across the terminals, the resistance remains high for a fixed time (depending on construction parameters) and then switches to a low resistance of about 5 ohms or less. The time to actually switch from about 1012 ohms to about 5 ohms is roughly a few seconds. The time between application of potential to the terminals and switching can be varied by the device design parameters to be from just a few seconds to 10 years or greater. As shown in the drawing, the device comprises an envelope of borosilicate glass tubing. The glass to electrode seal is a conventional glass to metal seal. The electrode has three requirements.