Granted Patent
Utility
US 4,914,413 · App. 07/398,232
Transformer with layer-wound and random wound windings
Inventor:
Roger A. McGrath
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Aug 24, 1989
Inventor
Roger A. McGrath
Assignee (at issue)
Magnetek, 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.