Granted Patent
Utility
US 6,567,590 · App. 09/761,697
Optical communication device
Inventors:
Takeshi Okada, Hiromi Nakanishi, Yoshiki Kuhara, Naoyuki Yamabayashi
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Jan 18, 2001
Inventors
Takeshi Okada
Hiromi Nakanishi
Yoshiki Kuhara
Naoyuki Yamabayashi
Assignees (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
NHK SPRING 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.