Granted Patent
Utility
US 6,443,592 · App. 09/498,167
Luminaire having annular inner housing with detachable annular louver support element
Inventors:
Helmuth K. Unger, Karl-Heinz Brechelt
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Feb 4, 2000
Inventors
Helmuth K. Unger
Karl-Heinz Brechelt
Assignee (at issue)
WILA Leuchten AG
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.