Granted Patent
Utility
US 6,172,581 · App. 09/309,764
Surface acoustic wave filters with cascaded transversely coupled mode resonator filters
Inventor:
Naoki Tanaka
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: May 11, 1999
Inventor
Naoki Tanaka
Assignee (at issue)
SANYO ELECTRIC CO., 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.