Granted Patent
Utility
US 6,684,022 · App. 10/036,201
Manual variable optical attenuator having sealing gasket
Inventor:
Yao-Hao Chang
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Dec 24, 2001
Inventor
Yao-Hao 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.