Inventor
DOWNEY WILLIAM L
US6 patents
Patents
6 patentsUS4506407AMar 26, 1985
Releasable hold-open device for a door closer
SCHLAGE LOCK CO110 citations94
US5709009AJan 20, 1998
Door closer for the non-fire side of a fire-door safety installation
SCHLAGE LOCK CO44 citations92
US5864920AFeb 2, 1999
Door closer for the non-fire side of a fire-door safety installation
SCHLAGE LOCK CO9 citations71
US5088152AFeb 18, 1992
Door security track
SCHLAGE LOCK CO10 citations71
US4916267AApr 10, 1990
Door closer position monitor
SCHLAGE LOCK CO9 citations71
US4835905AJun 6, 1989
Door position indicator for a door closer
SCHLAGE LOCK CO11 citations71