Granted Patent
Utility
US 4,907,145 · App. 07/350,313
Sine wave inverter
Inventor:
David Cassidy
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: May 11, 1989
Inventor
David Cassidy
Assignee (at issue)
Belmont Instrument, LLC
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.