Granted Patent
Utility
US 5,581,141 · App. 08/319,790
Surface acoustic wave filter
Inventors:
Toru Yamada, Toshio Ishizaki, Kazunori Nishimura, Kozo Murakami
Patented Case
View Patent ↗
Granted: Dec 3, 1996
Filed: Oct 7, 1994
Inventors
Toru Yamada
Toshio Ishizaki
Kazunori Nishimura
Kozo Murakami
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.