Granted Patent
Utility
US 4,935,677 · App. 07/308,047
Lock system for an automatic door
Inventor:
Yukio Yoshida
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Feb 9, 1989
Inventor
Yukio Yoshida
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.