Granted Patent
Utility
US 5,422,634 · App. 07/997,040
Locking system using a key including an IC memory
Inventor:
Masao Okubo
Patented Case
View Patent ↗
Granted: Jun 6, 1995
Filed: Dec 28, 1992
Inventor
Masao Okubo
Assignee (at issue)
Zexel GmbH
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.