Granted Patent
Utility
US 5,350,640 · App. 07/882,829
Detachable battery package with built-in integrating power meter
Inventor:
Keiji Masui
Patented Case
View Patent ↗
Granted: Sep 27, 1994
Filed: May 14, 1992
Inventor
Keiji Masui
Assignee (at issue)
NEC 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.