Granted Patent
Utility
US 6,744,307 · App. 10/406,186
Filter circuit
Inventors:
Takeshi Ikeda, Hiroshi Miyagi
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: Apr 4, 2003
Inventors
Takeshi Ikeda
Hiroshi Miyagi
Assignee (at issue)
Niigata Seimitsu 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.