Granted Patent
Utility
US 4,442,385 · App. 06/465,590
Variable frequency drive for a motor-generator/alternator set
Inventor:
Robert J. Van Sickle
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Feb 10, 1983
Inventor
Robert J. Van Sickle
Assignee (at issue)
POWER DISTRIBUTION, 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.