Granted Patent
Utility
US 5,724,909 · App. 08/804,026
Passive pathway marking system
Inventors:
Robert Pitman, Daniel L. Garrison
Patented Case
View Patent ↗
Granted: Mar 10, 1998
Filed: Feb 19, 1997
Inventors
Robert Pitman
Daniel L. Garrison
Assignee (at issue)
Burke Industries, 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.