Granted Patent
Utility
US 4,675,539 · App. 06/776,847
Backup power system
Inventor:
James W. Nichol
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Sep 17, 1985
Inventor
James W. Nichol
Assignee (at issue)
Codex 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.