Granted Patent
Utility
US 6,624,372 · App. 09/806,910
Gas insulated switchgear
Inventors:
Takemasa Ogawa, Kazuhiko Takahashi, Mamoru Okabe
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Apr 6, 2001
Inventors
Takemasa Ogawa
Kazuhiko Takahashi
Mamoru Okabe
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.