Granted Patent
Utility
US 6,754,481 · App. 09/814,537
Wireless prepaid telephone system with extended capability
Inventor:
Byard G. Nilsson
Patented Case
View Patent ↗
Granted: Jun 22, 2004
Filed: Mar 21, 2001
Inventor
Byard G. Nilsson
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.