Granted Patent
Utility
US 4,388,677 · App. 06/222,042
Recessed lighting unit
Inventor:
James B. Druffel
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Jan 2, 1981
Inventor
James B. Druffel
Assignee (at issue)
Prescolite, A Div. of U.S. Industries
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.