Granted Patent
Utility
US 4,853,665 · App. 07/264,474
Noise suppressing isolation transformer
Inventor:
John Olesak
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Oct 28, 1988
Inventor
John Olesak
Assignee (at issue)
Federal Signal Corporation
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.