Granted Patent
Utility
US 5,256,924 · App. 07/927,902
Superconducting commutator for DC machines
Inventor:
Richard L. Fischer
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Aug 10, 1992
Inventor
Richard L. Fischer
Assignee (at issue)
AlliedSignal, 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.