Tone controlled wireless telephone extension system

• US 3,366,880 A
• Filed: 11/08/1965
• Issued: 01/30/1968
• Est. Priority Date: 11/08/1965
• Status: Expired due to Term

• Current Assignee: Joel P. Driver
• Original Assignee: Joel P. Driver
• Inventors: Driver, Joel P.
• Application Number:
  US04/506,784
• Time in Patent Office: 813 Days
• US Class Current: 455/462
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04M 1/72502 with one base station connected to a single line

Claims

1. IN A REMOTER TELEPHONE EXTENSION SYSTEM, A FIRST TRANSCEIVER HAVING A FIRST TRANSMITTER SECTION AND A FIRST RECEIVER SECTION;

A FIRST ANTENNA;

FIRST ANTENNA SWITCH MEANS FOR SELECTIVELY CONNECTING SAID ANTENNA TO SAID TRANSMITTER SECTION OR SAID RECEIVER SECTION FOR OPERATION IN A TRANSMIT OR RECEIVE MODE, RESPECTIVELY, SAID FIRST TRANSCEIVER NORMALLY BEING IN ITS RECEIVE MODE. IMPEDANCE MATCHING MEANS ELECTRICALLY COUPLING SAID FIRST TRANSMITTER SECTION TO A TELEPHONE SYSTEM;

CONTROL CIRCUIT MEANS INCLUDING MONOSTABLE CIRCUIT MEANS RESPONSIVE TO SIGNALS FROM SAID TELEPHONE SYSTEM TO SWITCH SAID FIRST TRANSCEIVER TO ITS TRANSMIT MODE, SAID MONOSTABLE CIRCUIT REVERTING TO ITS STABLE STAGE AND RETURNING SAID FIRST TRANSCEIVER TO ITS RECEIVE MODE DURING ANY PAUSES IN SAID SIGNALS FROM SAID TELEPHONE SYSTEM;

FREQUENCY SENSITIVE FILTER MEANS IN CIRCUIT WITH SAID FIRST RECEIVER AND RESPONSIVE TO A RECEIVED SIGNAL OF PREDETERMINED CHARACTERISTIC FOR ENERGIZING FIRST RECIEVE SWITCH MEANS ELECTRICALLY TO COUPLE SAID FIRST RECEIVER SECTION THROUGH SAID IMPEDANCE MATCHING MEANS TO SAID TELEPHONE SYSTEM WITHOUT UNCOUPLING SAID FIRST TRANSMITTER SECTION FROM SAID TELEPHONE SYSTEM, SAID FREQUENCY SENSITIVE FILTER MEANS INCLUDING CONTROL CIRCUIT DISABLING MEANS FOR PREVENTING SAID FIRST TRANSCEIVER FROM SWITCHING TO ITS TRANSMIT MODE DURING RECEPTION OF SAID SIGNAL OF PREDETERMINED CHARACTERISTIC;

HOLDING MEANS INCLUDING A TIME DELAY MEANS FOR

21. IN A COMMUNICATIONS RECEIVER HAVING A RETRACTABLE ANTENNA, SAID RECEIVER BEING NORMALLY ON TO MONITOR INCOMING CALLS, A DETECTOR STAGE FOR SEPARATING RF CARRIER SIGNALS FROM AUDIO FREQUENCY SIGNALS, AN AUDIO STAGE FOR AMPLIFYING SAID AUDIO FREQUENCY SIGNALS FOR APPLICATION TO A LOUDSPEAKER MEANS, ATTENUATOR VOLUME CONTROL MEANS FOR SAID AUDIO FREQUENCY SIGNALS, AND BYPASS SWITCH MEANS OPERABLE BY SAID ANTENNA, SAID BYPASS SWITCH BEING CLOSED WHEN SAID ANTENNA IS RETRACTED TO BYPASS SAID VOLUME CONTROL, WHEREBY THE FULL AMPLITUDE OF SAID AUDIO FREQUENCY SIGNALS IS APPLIED TO SAID LOUDSPEAKER MEANS.