Granted Patent
Utility
US 6,672,740 · App. 09/604,921
Condensing and collecting optical system using parabolic reflectors or a corresponding ellipsoid/hyperboloid pair of reflectors
Inventor:
Kenneth Li
Patented Case
View Patent ↗
Granted: Jan 6, 2004
Filed: Jun 28, 2000
Inventor
Kenneth Li
Assignee (at issue)
Cogent Light Technologies, 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.