Granted Patent
Utility
US 6,154,139 · App. 09/063,715
Method and system for locating subjects within a tracking environment
Inventor:
Alan C. Heller
Patented Case
View Patent ↗
Granted: Nov 28, 2000
Filed: Apr 21, 1998
Inventor
Alan C. Heller
Assignee (at issue)
VERSUS TECHNOLOGY, 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.