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Title: Coulometrically timed indicator lamp circuits operable from high voltages

Abstract: A three terminal coulometric timer cell is provided having two terminals available to detect continuity of an anode filament that is ruptured after a predetermined time period by plating away upon a cathode cup-like container. Connected across said two terminals is a light emitting diode to visually indicate the end of the time period. Simplified circuit configurations requiring only the cell, two resistors and the light emitting diode are provided with variations permitting AC -- DC operation, reliable high voltage operation, low operating power and temperature stable operation.


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Other info:


Inventors: Jones, John Paul (Wayne, PA, US)

Application Number: 548445
Filing Date: 1975-02-10
Publication_date: 1976-08-10
Assignee: Air Products and Chemicals, Inc. (Allentown, PA)
Primary Class(es): 340/309.16 327/513, 340/635, 368/114
Other Classes:
US Patent Ref:
3192405Jun, 1965Patchell307/310.
3355731Nov, 1967Jones340/309.

Other Refs:
Primary Examiner: Caldwell, John W.
Assistant Examiner: Wannisky, William M.
Attorney: Simmons; James C., Moyerman; Barry