Granted Patent
Utility
US 6,434,535 · App. 09/191,976
System for prepayment of electronic content using removable media and for prevention of unauthorized copying of same
Inventors:
Michael S. Kupka, Michael G. Lundgren
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Nov 13, 1998
Inventors
Michael S. Kupka
Michael G. Lundgren
Assignee (at issue)
IO-Mega Holding 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.