Portable radio telephone which terminates an electronic keypad l

Details Portable radio telephone which terminates an electronic keypad l Portable radio telephone which terminates an electronic keypad l

1991-04-17

1993-08-31

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 63, 3408255, H04M 1100

Patent

active

052415830

ABSTRACT:
A portable radio telephone has a keypad including a plurality of externally accessible keys. The keys can be disabled (i.e. the keypad can be locked) to prevent accidental actuation thereof by performing a predetermined order of keystrokes using two of the keys which ordinarily have an alternative function associated therewith. Thus, for example, depression of the # key followed by the ON/OFF key temporarily enables the keyboard lock. The lock can be disabled simply by repeating the same keystrokes.

REFERENCES:
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patent: 4453042 (1984-06-01), Wolf et al.
patent: 4670747 (1987-06-01), Borras et al.
patent: 4724537 (1988-02-01), Monet
patent: 4737981 (1988-04-01), Hoberman et al.
patent: 4843385 (1989-06-01), Borras
patent: 4845772 (1989-07-01), Metroka et al.
patent: 4860336 (1989-08-01), D'Avello et al.
patent: 4945556 (1990-07-01), Namekawa

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