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Us Patents
Telephone Security System For Cordless Telephony
US Patent:
4436957, Mar 13, 1984
Filed:
Dec 22, 1981
Appl. No.:
6/333528
Inventors:
Frank J. Mazza - Edison NJ
John DeFilippis - South Amboy NJ
John DeFilippis - South Amboy NJ
Assignee:
International Telephone and Telegraph Corporation - New York NY
International Classification:
H04M 166
H04Q 704
H04Q 704
US Classification:
179 2EA
Abstract:
A telephone security system particularly for use with cordless telephone, operates to prevent the base station of the system from being accessed by an unauthorized user. Preselected digits are set by means of switches. In order to receive a dial tone, the correct digits as selected by the switches must be dialed. The security system operates to compare the dialed digits with those digits set by the switches. If a favorable comparison is had, the security device then connects the telephone line to the base station and allows dial tone to be transmitted to thereby enable a call to be implemented by the user.
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