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Telephone transmitter and receiver

  • US 3,919,491 A
  • Filed: 09/12/1973
  • Issued: 11/11/1975
  • Est. Priority Date: 09/12/1973
  • Status: Expired due to Term
First Claim
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1. In a telephone having a base with a cradle and a handset removably mountable on the cradle thereof, a telephone extension comprising:

  • a. a base station in the telephone base, said base station coupled to the telephone line and having a receiver to receive sound communication from the telephone handset and sEnd it as outgoing speech signals on the line, and a transmitter to transmit incoming speech signals from the line to the telephone handset, b. a portable station in the handset having a transmitter to transmit sound communication from the handset microphone to said base station receiver, and having a receiver to receive said incoming speech signals from said base station transmitter and relay them to the handset speaker, c. said handset being physically connectable with the telephone base by a removable plug, said handset to be normally used as a usual telephone handset when said plug is connected to said telephone base, said plug, upon removal from said base, activating said base station and portable station transmitters and receivers to allow remote communication between handset and base.

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