Granted Patent
Utility
US 6,316,852 · App. 09/556,175
Rotating machine
Inventors:
Akitomi Semba, Tadashi Sonobe
Patented Case
View Patent ↗
Granted: Nov 13, 2001
Filed: Apr 20, 2000
Inventors
Akitomi Semba
Tadashi Sonobe
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.