Granted Patent
Utility
US 6,220,444 · App. 09/270,183
Method and apparatus for marking containers with magnetic code and detecting the marked container using a magnetic sensing device
Inventor:
Fred L. Calhoun
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Mar 15, 1999
Inventor
Fred L. Calhoun
Assignee (at issue)
INDUSTRIAL DYNAMICS COMPANY, LTD.
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.