Granted Patent
Utility
US 4,656,589 · App. 06/682,930
Method and apparatus for operating turbo compressor using analog and digital control schemes
Inventors:
Rolf Albers, Wilfried Blotenberg
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Dec 18, 1984
Inventors
Rolf Albers
Wilfried Blotenberg
Assignee (at issue)
M.A.N. Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
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.