Granted Patent
Utility
US 6,497,493 · App. 09/850,397
Illuminated safety helmet
Inventor:
David A. Theisen
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: May 7, 2001
Inventor
David A. Theisen
Assignee (at issue)
Marpac, 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.