Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Apparatus for controlling the operation of a door movable in a door opening to prevent contact between the door and an obstruction in the door opening

Apparatus for controlling the operation of a door movable in a door opening to prevent contact between the door and an obstruction in the door opening

US Patent 6080981 · Granted Jun 27, 2000

Assignee

No assignee recorded.

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Laser light transmitter and proximity detector1995
Automatic control using proximity sensors1991
Proximity detector circuitry especially for lift doors1985
Monitoring and controlling lift positions1984