Radio telecommunication apparatus having an operation disabling

Details Radio telecommunication apparatus having an operation disabling Radio telecommunication apparatus having an operation disabling

1991-05-30

1993-10-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 331, 379 58, 379 59, 3408255, H04B 140

Patent

active

052574121

ABSTRACT:
The automobile telephone apparatus comprises the EEPROM, into which a telephone number MIN, and a system identification number SID of a geographical area corresponding thereto are written before shipment. A predetermined operation disabling code is stored in the EEPROM, and the apparatus is disabled while this code is stored therein. Each of the product apparatus is assigned with its own disabling code. When the assigned disabling code is input to the CPU from the keyboard, the CPU erase the disabling code stored in the EEPROM, enabling the apparatus to be used. A purchaser who buys this automobile telephone apparatus informs the service company of the serial number of the apparatus, along with his or her name and address. When the contract between the company and the user for registration has been completed, the user is informed of the operation disabling code of the purchased apparatus. Upon inputting the disabling code by the user, the prohibition of the operation is released, and therefore, the apparatus becomes ready to be used.

REFERENCES:
patent: 4843385 (1989-06-01), Borras
patent: 4945556 (1990-07-01), Namekana
patent: 5077790 (1991-12-01), D'Amico et al.

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