Granted Patent
Utility
US 5,526,428 · App. 08/175,032
Access control apparatus and method
Inventor:
Todd W. Arnold
Patented Case
View Patent ↗
Granted: Jun 11, 1996
Filed: Dec 29, 1993
Inventor
Todd W. Arnold
Assignee (at issue)
International Business Machines Corporation
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.