Granted Patent
Utility
US 5,959,408 · App. 08/908,393
Symmetry control circuit for pre-heating in electronic ballasts
Inventors:
John F. Steel, Bryce L. Hesterman
Patented Case
View Patent ↗
Granted: Sep 28, 1999
Filed: Aug 7, 1997
Inventors
John F. Steel
Bryce L. Hesterman
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.