Granted Patent
Utility
US 6,694,810 · App. 10/201,896
Air flow meter
Inventors:
Kei Ueyama, Izumi Watanabe, Keiichi Nakada, Junichi Horie
Patented Case
View Patent ↗
Granted: Feb 24, 2004
Filed: Jul 25, 2002
Inventors
Kei Ueyama
Izumi Watanabe
Keiichi Nakada
Junichi Horie
Assignees (at issue)
HITACHI, LTD.
HITACHI CAR ENGINEERING 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.