Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Light emitting diode message waiting lamp circuit

Light emitting diode message waiting lamp circuit

US Patent 4648109 · Granted Mar 3, 1987

Estimated economic value: $2,748,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Power converter feedback circuit2008
Parallel phased switch control2003
Buck converter with parallel switches2001
Apparatus and method for signal handling on GTL-type buses1998
Coin relay drive and switching circuit for paystation telephone instruments1988
Differential receive booster amplifier for telephone instruments1988
Telephone security violation detection device1987
High performance telephone instrument with combination pulse and tone dialing ca1987
Telephone line monitor amplifier1987
Temperature compensated reference circuit1987
Integrated circuit temperature sensor1986
Static discharge snubber circuit for silicon controlled rectifier (SCR) type tel1986