Granted Patent
Utility
US 6,540,482 · App. 09/811,495
Turbo-type machines
Inventors:
Kouichi Irie, Tomoyoshi Okamura, Sumio Sudo, Junichi Kurokawa
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Mar 20, 2001
Inventors
Kouichi Irie
Tomoyoshi Okamura
Sumio Sudo
Junichi Kurokawa
Assignees (at issue)
HITACHI, LTD.
Junichi Kurokawa
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.