Granted Patent
Utility
US 6,802,689 · App. 10/233,536
Turbo type fluid machine and dry gas seal for use therefor
Inventor:
Hideto Nogiwa
Patented Case
View Patent ↗
Granted: Oct 12, 2004
Filed: Sep 4, 2002
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.