Granted Patent
Utility
US 6,313,938 · App. 09/437,224
Planar lightwave circuit module and optical fiber amplifying device
Inventors:
Shigeru Shikii, Akira Sasaki
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Nov 10, 1999
Inventors
Shigeru Shikii
Akira Sasaki
Assignee (at issue)
OKI ELECTRIC INDUSTRY CO., LTD.
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.