Granted Patent
Utility
US 6,476,691 · App. 09/762,025
Surface acoustic wave filter
Inventors:
Shigeru Tsuzuki, Tsutomu Igaki, Ken Matsunami, Kazunori Nishimura, Hiroyuki Nakamura, Toru Yamada
Patented Case
View Patent ↗
Granted: Nov 5, 2002
Filed: Apr 6, 2001
Inventors
Shigeru Tsuzuki
Tsutomu Igaki
Ken Matsunami
Kazunori Nishimura
Hiroyuki Nakamura
Toru Yamada
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.