×

Cordless telephone network

  • US 4,878,238 A
  • Filed: 12/23/1987
  • Issued: 10/31/1989
  • Est. Priority Date: 12/23/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. A cordless telephone network comprising:

  • a base unit that is interconnected into a normal telephone network by at least one telephone line for making connection with said telephone line upon receiving a call from said telephone line or upon being requested to do so by a hand-held unit, said base unit including a base unit cordless transmitter/receiver means for cordlessly communicating two-way calls between said at least one telephone line and any one of a plurality of hand-held cordless telephones, said base unit including a temporary memory means therein for receiving a distinctive identifying signal of a hand-held cordless telephone to be communicated with for each call upon initiation of said call by either said telephone line or said hand held unit and storing said distinctive identifying signal in said temporary memory thereof during said call, said base unit and said hand-held cordless telephone communicating with one another using cordless waves having a power range of only around 1,000 feet or less on only cordless telephone channels, said base unit including a monitoring means for monitoring a cordless wave channel on which said hand-held unit is operating during said call, allowing only a hand-held cordless telephone emitting said temporarily memorized identifying signal in combination with a ring signal or hang up signal to respectively communicate said ring or hang up signal to said at least one telephone line, said base unit only emitting ring signals and hang up signals to said hand-held unit during said call in combination with said distinctive identifying signal, said base unit including means for erasing said distinctive identifying signal from said temporary memory upon completion of said call thereby freeing said base unit for communicating ring signals between another one of said plurality of said hand-held cordless telephones and said at least one telephone line.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×