Granted Patent
Utility
US 6,495,786 · App. 09/677,602
Vacuum exhaust element of vacuum switch
Inventors:
Masashige Tsuji, Ayumu Morita, Toru Tanimizu, Katsunori Kojima, Yuichi Ishikawa, Yoshiharu Yotsumoto
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: Oct 3, 2000
Inventors
Masashige Tsuji
Ayumu Morita
Toru Tanimizu
Katsunori Kojima
Yuichi Ishikawa
Yoshiharu Yotsumoto
Assignee (at issue)
HITACHI, 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.