Granted Patent
Utility
US 4,284,933 · App. 06/054,465
Control circuit for reducing field voltage in D.C. motors
Inventors:
Franz Galliker, Peter Knapp
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Jul 3, 1979
Inventors
Franz Galliker
Peter Knapp
Assignee (at issue)
BBC Brown, Boveri & Company Ltd.
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.