Granted Patent
Utility
US 6,169,389 · App. 09/286,055
Pumped capacitive storage system
Inventor:
William Chen
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Apr 5, 1999
Inventor
William Chen
Assignee (at issue)
Marconi Communications GmbH
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.