Granted Patent
Utility
US 6,524,059 · App. 09/508,248
Turbo fluid machinery and dry gas seal used for the machinery
Inventor:
Hideto Nogiwa
Patented Case
View Patent ↗
Granted: Feb 25, 2003
Filed: Mar 9, 2000
Inventor
Hideto Nogiwa
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.