Granted Patent
Utility
US 5,729,458 · App. 08/581,169
Cost zones
Inventor:
Richard F. Poppen
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Dec 29, 1995
Inventor
Richard F. Poppen
Assignee (at issue)
Etak, 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.