Granted Patent
Utility
US 4,648,425 · App. 06/179,879
System and method of confirming operation of a steam relieving safety valve for a water-cooled nuclear reactor
Inventors:
Kenshu Watanabe, Tadashi Uchikawa, Masashi Takiyama, Takashi Kurahashi
Patented Case
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Granted: Mar 10, 1987
Filed: Aug 20, 1980
Inventors
Kenshu Watanabe
Tadashi Uchikawa
Masashi Takiyama
Takashi Kurahashi
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.