Granted Patent
Utility
US 6,185,682 · App. 09/090,101
Authentication system
Inventor:
Wei Tang
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Jun 3, 1998
Inventor
Wei Tang
Assignee (at issue)
U.S. Philips 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.