Browse Prior Art Database

Electrochemical Timing Device

IP.com Disclosure Number: IPCOM000083049D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Sambucetti, CJ: AUTHOR

Abstract

There is a need for a timing device or indicator which forms part of a product such as a terminal or the like, and which timing device indicates, either visually or by an alarm, that the product is due for service.

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Electrochemical Timing Device

There is a need for a timing device or indicator which forms part of a product such as a terminal or the like, and which timing device indicates, either visually or by an alarm, that the product is due for service.

A timing device is comprised of a reversible cell 2, which includes a dissolving anode or filament 4 surrounded by a concentric cathode 6 which houses an electrolyte 8. A DC source 10 provides a low voltage on the order 2-6 volts between the filament 4 and the cathode housing 6 by way of a direct connection to the cathode housing 6 and to the filament by way of a resistor 12.

A resistor 14 and a warning light 16 are connected between the resistor 12 and the cathode housing 6, with the resistance of the resistor 14 being very much larger than the resistance of the resistor 12.

When the voltage from the source 10 is initially applied, current flows from the positive anode of the battery through the resistor 12, the filament 4 and to the cathode housing 6 and back to the cathode electrode of the battery 10. There is anodic dissolution of the filament 4 in response to the current flow through the filament. The cell 2 continues to operate for as long as there is metallic continuity through the filament 4.

After a predetermined time, all of the filament 4 is dissolved, and the device 2 ceases to operate, resulting in a negligible amount of current flow through the cell 2, resulting in current flow through the resistor 14 and the...