Granted Patent
Utility
US 5,138,638 · App. 07/640,272
System for determining the number of shoppers in a retail store and for processing that information to produce data for store management
Inventor:
Ronald G. Frey
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Jan 11, 1991
Inventor
Ronald G. Frey
Assignee (at issue)
Tytronix 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.