Inventor
TONNA CHRISTIAN G
FR7 patents
⚠️ This page may combine multiple inventors who share the name “TONNA CHRISTIAN G”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OTIS ELEVATOR CO
6 patentsUS5139112AAug 18, 1992
Elevator car door lock
OTIS ELEVATOR CO22 citations91
US7246688B2Jul 24, 2007
Elevator door system
OTIS ELEVATOR CO16 citations89
US5584365ADec 17, 1996
Telescoping elevator door system
OTIS ELEVATOR CO9 citations71
US5207298AMay 4, 1993
Elevator rotary door interlock
OTIS ELEVATOR CO2 citations58
US5203431AApr 20, 1993
Elevator rotary lost door interlock
OTIS ELEVATOR CO3 citations58
US5129486AJul 14, 1992
Elevator door lock
OTIS ELEVATOR CO5 citations58