Granted Patent
Utility
US 4,251,151 · App. 05/937,911
Apparatus including battery check circuit
Inventor:
Kenji Toyota
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Aug 30, 1978
Inventor
Kenji Toyota
Assignee (at issue)
Nippon Kogaku K.K.
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.