Granted Patent
Utility
US 5,884,994 · App. 08/760,348
Direct-indirect luminaire with improved down light control
Inventors:
Douglas J. Herst, Peter Y. Y. Ngai
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Dec 4, 1996
Inventors
Douglas J. Herst
Peter Y. Y. Ngai
Assignee (at issue)
Peerless Lighting Corporation
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.