Cordless telephone network
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 31, 1989
Grant Date -
N/A
app pub date -
Dec 23, 1987
filing date -
Dec 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cordless telephone network comprises a base unit (12) that is interconnected into a normal telephone network (19) and a plurality of hand-held cordless telephones (20). Each of the hand-held cordless telephones has a distinctive identification code and the base unit temporarily stores the identification code of the hand-held unit with which it is communicating during a call and will not communicate with other hand-held units having different identification codes during that call. Each of the hand-held units has the ability to scan a plurality of cordless telephone channels for either receiving a call on a channel on which its identification code is transmitted or placing a call on a channel on which a base unit transmits a 'free channel' signal. The hand-held units each have a voice activation/deactivation circuit which allows the hand-held unit to send and receive audio signals only when it has been given permission to do so by a base unit.
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