The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 1990
Filed:
Mar. 03, 1989
Stephen T Sarakas, St. Peters, MO (US);
Other;
Abstract
A call screening device is disclosed for use with a telephone system including one or more telephones connected to outside telephone service in order to screen incoming call signals directed to the telephone system and for providing, in response to a preselected security code signal, the incoming call signals to the telephones. The call screening device includes circuitry for storing the preselected security code signal and for receiving the incoming call signal and an incoming code signal from the outside telephone service. Circuitry is provided for comparing the incoming code signal with the preselected security code signal and for providing the call signal to one or more telephones when the comparing circuitry determines the incoming code signal corresponds to the preselected security code signal. The device may be activated or deactivated in response to a preselected control signal from any of the telephones. The device also includes circuitry for providing a ringing signal to each of the telephones during a period beginning with determination by the comparator circuitry that the incoming code signal received by the receiver circuitry corresponds to the preselected security code signal and ending with termination of the incoming call signal or answering of any one of the telephones, whichever occurs first.