Granted Patent
Utility
US 6,437,631 · App. 09/867,354
Analog multiplying circuit and variable gain amplifying circuit
Inventor:
Yasuhiro Amano
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: May 29, 2001
Inventor
Yasuhiro Amano
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.