Granted Patent
Utility
US 5,850,493 · App. 08/896,540
Device for focusing light through an optical component
Inventor:
Yihao Cheng
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Jul 18, 1997
Inventor
Yihao Cheng
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.