Granted Patent
Utility
US 6,690,559 · App. 09/872,351
Charge/discharge type power supply
Inventor:
Shinichi Yoshida
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Jun 1, 2001
Inventor
Shinichi Yoshida
Assignee (at issue)
SEIKO INSTRUMENTS 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.