Granted Patent
Utility
US 6,438,278 · App. 09/239,203
Fiber optical circulator
Inventors:
Zhimin Liu, Jiwu Ling
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Jan 28, 1999
Inventors
Zhimin Liu
Jiwu Ling
Assignee (at issue)
Telelight Communication 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.