Granted Patent
Utility
US 6,478,357 · App. 09/962,080
Automatic door operating device
Inventor:
Zhenjia Zhou
Patented Case
View Patent ↗
Granted: Nov 12, 2002
Filed: Sep 26, 2001
Inventor
Zhenjia Zhou
Assignee (at issue)
Ohi Seisakusho Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.