Granted Patent
Utility
US 5,451,843 · App. 08/231,181
Apparatus and method for providing bilevel illumination
Inventors:
Michael J. Kahn, Bernard Kohanski
Patented Case
View Patent ↗
Granted: Sep 19, 1995
Filed: Apr 22, 1994
Inventors
Michael J. Kahn
Bernard Kohanski
Assignee (at issue)
Ruud Lighting, 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.