Granted Patent
Utility
US 5,557,921 · App. 08/414,740
Power plant
Inventors:
Hans Ulrich Frutschi, Hans Wettstein
Patented Case
View Patent ↗
Granted: Sep 24, 1996
Filed: Mar 31, 1995
Inventors
Hans Ulrich Frutschi
Hans Wettstein
Assignee (at issue)
ABB Management AG
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.