Granted Patent
Utility
US 4,990,053 · App. 07/369,331
Device for extending the performances of a radial compressor
Inventor:
Karl-Heinz Rohne
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jun 21, 1989
Inventor
Karl-Heinz Rohne
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.