Granted Patent
Utility
US 4,979,873 · App. 07/302,373
Steam turbine
Inventor:
Jan-Erik Bertilsson
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Jan 27, 1989
Inventor
Jan-Erik Bertilsson
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.