Granted Patent
Utility
US 6,492,721 · App. 09/330,080
High-voltage signal detecting circuit
Inventor:
Takayuki Shirai
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jun 11, 1999
Inventor
Takayuki Shirai
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.