Granted Patent
Utility
US 4,581,900 · App. 06/685,686
Method and apparatus for detecting surge in centrifugal compressors driven by electric motors
Inventors:
Madeleine M. Lowe, Robert T. Hagerman
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Dec 24, 1984
Inventors
Madeleine M. Lowe
Robert T. Hagerman
Assignee (at issue)
BorgWarner Inc.
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.