Granted Patent
Utility
US 6,492,054 · App. 09/451,973
Polymer electrolyte fuel cell including a water-retaining layer on a ribbed plate
Inventors:
Mitsuo Karakane, Takashi Yasuo, Shigeru Sakamoto, Yasunori Yoshimoto, Yasuo Miyake, Ikuo Yonezu, Koji Nishio
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Nov 30, 1999
Inventors
Mitsuo Karakane
Takashi Yasuo
Shigeru Sakamoto
Yasunori Yoshimoto
Yasuo Miyake
Ikuo Yonezu
Koji Nishio
Assignee (at issue)
SANYO ELECTRIC 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.