Granted Patent
Utility
US 4,939,627 · App. 07/407,721
Indirect luminaire having a secondary source induced low brightness lens element
Inventors:
Douglas J. Herst, Peter Y. Y. Ngai
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Sep 14, 1989
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.