Granted Patent
Utility
US 6,624,889 · App. 10/135,256
Cascaded filter employing an AOTF and narrowband birefringent filters
Inventor:
Shifang Li
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Apr 29, 2002
Inventor
Shifang Li
Assignee (at issue)
Oplink Communications, LLC
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.