Granted Patent
Utility
US 5,841,847 · App. 08/827,784
Billing system
Inventors:
R. William Graham, David M. Tumey
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Apr 11, 1997
Inventors
R. William Graham
David M. Tumey
Assignee (at issue)
Protel, Inc.
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.