Granted Patent
Utility
US 6,557,747 · App. 09/989,215
Highly gas tight chamber and method of manufacturing same
Inventor:
Katsumi Watanabe
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Nov 20, 2001
Inventor
Katsumi Watanabe
Assignee (at issue)
FURUKAWA ELECTRIC 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.