1975-05-19
1978-02-28
Jackmon, Edith S.
58 50R, G04C 300, G04B 1900
Patent
active
040758265
ABSTRACT:
A timing circuit in a digital watch with a two digit display. When the circuit is activated by a push button, the two display elements first display the hours information, for as long as the push button is depressed, and after release of the push button, the display elements show minutes for about one-half second before turning off.
REFERENCES:
patent: 3828548 (1974-08-01), Martin
patent: 3839856 (1974-10-01), Dargent
patent: 3854277 (1974-12-01), Samejima
patent: 3943696 (1976-03-01), Portmann et al.
Robert Lyon Caen, Diodes, Transistors and Integrated Circuits for Switching Systems, 1968, pp. 351-355.
Hughes Aircraft Company
Jackmon Edith S.
Konzem F. I.
MacAllister W. H.
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