Granted Patent
Utility
US 4,658,197 · App. 06/178,796
Motor control circuit
Inventor:
James R. Ligman
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Aug 18, 1980
Inventor
James R. Ligman
Assignee (at issue)
Casablanca Fan Company
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.