Granted Patent
Utility
US 6,724,971 · App. 10/092,202
Variable optical attenuator
Inventor:
Chih-Chiang Chang
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Mar 4, 2002
Inventor
Chih-Chiang Chang
Assignee (at issue)
Hon Hai Precision Ind. 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.