Electrical transmission or interconnection systems – Switching systems – Plural switches
Reexamination Certificate
2002-12-11
2008-01-29
Sherry, Michael (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
Plural switches
C713S310000, C341S022000
Reexamination Certificate
active
07323795
ABSTRACT:
An apparatus for powering on a terminal with a keypad by randomly selecting any key of the keypad. The keypad includes a plurality of keys, each of which has at least one set of contacts. The apparatus comprises a device controlled in such a manner as to be enabled to receive a battery voltage and supply a system voltage, a controller for, upon sensing a random key selection, generating a power on/off signal of a first state to continuously supply power to the terminal until a power off state is sensed and, upon sensing a power on state, generating a key on/off signal of a first state to operate subsequent input keys as general keys, and a key array switch including a plurality of first switches each for connecting one of the two contacts of each key arrayed in a corresponding row to the battery voltage, and a plurality of second switches each for connecting the other contact of each key arrayed in a corresponding column to an enable terminal of the system voltage supply device, the key array switch being disabled in response to the key on/off signal of the first state.
REFERENCES:
patent: 3534904 (1970-10-01), Kalthoff et al.
patent: 4959831 (1990-09-01), Wroblewski
patent: 5347167 (1994-09-01), Singh
patent: 5692203 (1997-11-01), Grodevant
patent: 6717531 (2004-04-01), Hayashi
Deschere Andrew
Samsung Electronics Co,. Ltd
Sherry Michael
The Farrell Law Firm PC
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