Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Instructional flip plate informational system

Instructional flip plate informational system

US Patent 4323023 · Granted Apr 6, 1982

Estimated economic value: $1,164,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Electronic industrial motor operator control system2005
Fail safe one wire interface for optical emitter-detector photo-eye systems with2005
Electronic water solution level detector2004
Noise reduction in an on-line battery impedance measurement system1998
Method and apparatus for controlling refrigerant gas in a low pressure refrigera1996
Method and apparatus for controlling refrigerant gas in a low pressure refrigera1994
Single phase AC motor speed control system1994
Motor overload indicating arrangement1992
Safety arrangement for automatic door operator1992
Apparatus for measuring internal resistance of wet cell storage batteries having1991
Single switch electric fan control1991
Emergency light control and battery charging system1989