Granted Patent
Utility
US 6,820,205 · App. 09/788,812
Electric power unit with a battery and a memory for recording the date of first use of the battery
Inventors:
Shigefumi Odaohhara, Arimasa Naitoh
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Feb 20, 2001
Inventors
Shigefumi Odaohhara
Arimasa Naitoh
Assignee (at issue)
International Business Machines 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.