Granted Patent
Utility
US 6,236,243 · App. 09/291,319
Negative voltage level detection circuit
Inventor:
Toshio Takeshima
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Apr 15, 1999
Inventor
Toshio Takeshima
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.