Granted Patent
Utility
US 5,670,209 · App. 08/589,929
High brightness durable retro-reflecting microspheres and method of making the same
Inventor:
Charles W. Wyckoff
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Jan 23, 1996
Inventor
Charles W. Wyckoff
Assignee (at issue)
BRITE-LINE TECHNOLOGIES, LLC
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.