Granted Patent
Utility
US 6,640,635 · App. 10/011,486
Method of measuring hydrogen concentration of radioactive metallic material
Inventor:
Masafumi Nakatsuka
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Dec 11, 2001
Inventor
Masafumi Nakatsuka
Assignees (at issue)
Kabushiki Kaisha Toshiba
HITACHI, LTD.
Nippon Nuclear Fuel Development 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.