Granted Patent
Utility
US 5,388,397 · App. 08/147,589
Method for operating a turbocompressor
Inventor:
Hans Ulrich Frutschi
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Nov 5, 1993
Inventor
Hans Ulrich Frutschi
Assignee (at issue)
Asea Brown Boveri, S.A.
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.