Telephone system in which communication between stations is controlled by computers at each individual station
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 14, 1981
Issued Date -
N/A
app pub date -
Jan 8, 1979
filing date -
Jan 8, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone system is provided which requires no central office. All the stations on the system are interconnected by a single line or cable and each station includes a computer which carries out the necessary switching. Each station is then able to call any other station, or to respond to a call, without requiring any central office. Frequency division multiplexing is used to permit a number of conversations to be carried on simultaneously and two frequencies are assigned to each conversation to permit duplex operation. A page capability is also provided.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully