Granted Patent
Utility
US 6,014,256 · App. 09/045,946
Polarizing beam splitter/combiner
Inventor:
Yihao Cheng
Patented Case
View Patent ↗
Granted: Jan 11, 2000
Filed: Mar 23, 1998
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.