Circuit for electronic watches

Details Circuit for electronic watches Circuit for electronic watches

1975-12-29

1977-10-11

Schaefer, Robert K.

58 23R, G04B 1930

Patent

active

040528421

ABSTRACT:
A circuit for electronic watches to enable selection between a 12 hour clock display and a 24 hour clock display. The circuit is driven by the hours counter of a watch and includes a control input for selecting the mode of operation and a logic network having outputs for controlling the display of the tens of hours and, for a 12 hour clock system, for controlling an AM or PM display.

REFERENCES:
patent: 3699763 (1972-10-01), Zeph
patent: 3738099 (1973-06-01), Tanaka
patent: 3772874 (1973-11-01), Lefkowitz
patent: 3795098 (1974-03-01), Fujita
patent: 3795099 (1974-03-01), Tsuruishi
patent: 3838565 (1974-10-01), Carlyle
patent: 3910030 (1975-10-01), Iwade
patent: 3946550 (1971-03-01), Fujija

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