P
PatentIndex
Search
Landscape
Sign in
Inventor
XUE HAIYAN
CN
2 patents
Patents
2 patents
US11577930B2
Feb 14, 2023
Automatic elevator calling system and a method for controlling automatic calling elevator
OTIS ELEVATOR CO
0 citations
45
US11524867B2
Dec 13, 2022
Determination of non-normal elevator calling request in an automatic elevator calling request system
OTIS ELEVATOR CO
0 citations
45