Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Obstruction detection in automatic portal control apparatus employing induction motor power factor

Obstruction detection in automatic portal control apparatus employing induction motor power factor

US Patent 4855653 · Granted Aug 8, 1989

Estimated economic value: $8,150,000 ⓘ

Assignee

No assignee recorded.

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Gate operator with persistant, audible warning signal1989
Control systems for gates and the like including a motor overload monitoring cir1983