Granted Patent
Utility
US 6,312,847 · App. 09/258,568
Base tube for fuel cell
Inventors:
Hiroshi Tsukuda, Akihiro Yamashita, Kenichiro Kosaka, Nagao Hisatome, Toru Houjyou
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Feb 26, 1999
Inventors
Hiroshi Tsukuda
Akihiro Yamashita
Kenichiro Kosaka
Nagao Hisatome
Toru Houjyou
Assignee (at issue)
MITSUBISHI ELECTRIC CORPORATION
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.