Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Door position indicator for a door closer

Door position indicator for a door closer

US Patent 4835905 · Granted Jun 6, 1989

Estimated economic value: $2,835,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Door closer for the non-fire side of a fire-door safety installation1999
Door closer for the non-fire side of a fire-door safety installation1998
Apparatus and method for increasing the efficiency of a door closer by reducing 1993
Door security track1992
Variable position door closer1990
Door closer position monitor1990
Door closer position monitor1990
Tamper resistant track assembly1989
Releasable hold-open device for a door closer1985