Granted Patent
Utility
US 5,696,321 · App. 08/544,648
Thermal-type air flow measuring instrument with fluid-direction judging capability
Inventors:
Shinya Igarashi, Chihiro Kobayashi, Yasunori Mouri, Hitoshi Ishikawa, Kaoru Uchiyama
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Oct 18, 1995
Inventors
Shinya Igarashi
Chihiro Kobayashi
Yasunori Mouri
Hitoshi Ishikawa
Kaoru Uchiyama
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.