Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Apparatus for detecting the closure of a subscriber's line during ringing

Apparatus for detecting the closure of a subscriber's line during ringing

US Patent 4356355 · Granted Oct 26, 1982

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Echo canceller using delta modulation1989
Anti-larsen-effect arrangement in a telephone station equipped with a loudspeake1984
Current mirror circuit1984
Hands free telephone with switchable gain in the two speech signal paths1984
Hands free telephone with switchable gain in the two speech signal paths1984
Arrangement for avoiding annoying sustained oscillations in a closed-loop system1984
Electronic subscriber line interface circuit having means to equalize current th1983
Electronic subscriber line interface circuit having means to equalize current th1983
Electronic subscriber line interface circuit having means to equalize current th1983
Automatic sound level control of telephone station1983
Electronic subscriber junctor1982
Subscriber's connecting network comprising a symmetrical power amplifier for fee1982