Granted Patent
Utility
US 6,429,893 · App. 09/090,501
Security system
Inventor:
Alfred X. Xin
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: Jun 4, 1998
Inventor
Alfred X. Xin
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.