Granted Patent
Utility
US 4,697,383 · App. 06/873,357
Controlling device for an automatic door
Inventor:
Isao Hagiwara
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Jun 12, 1986
Inventor
Isao Hagiwara
Assignee (at issue)
Yoshida Kogyo K.K.
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.