Granted Patent
Utility
US 6,480,309 · App. 09/379,364
Optical gate based optical space division switch
Inventors:
Sang-Rok Lee, Wan Seok Seo, Sung-Un Lee, Byeong Yoon, Joon Hak Bang, Jong Hyun Lee
Patented Case
View Patent ↗
Granted: Nov 12, 2002
Filed: Aug 23, 1999
Inventors
Sang-Rok Lee
Wan Seok Seo
Sung-Un Lee
Byeong Yoon
Joon Hak Bang
Jong Hyun Lee
Assignee (at issue)
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
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.