Granted Patent
Utility
US 5,994,794 · App. 08/853,751
Methods and apparatus for providing protection to batteries in an uninterruptible power supply
Inventor:
David J. Wehrlen
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: May 9, 1997
Inventor
David J. Wehrlen
Assignee (at issue)
Active Power, 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.