Granted Patent
Utility
US 4,888,988 · App. 07/137,299
Silicon based mass airflow sensor and its fabrication method
Inventors:
Ki Wook Lee, Il Hyun Choi
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Dec 23, 1987
Inventors
Ki Wook Lee
Il Hyun Choi
Assignee (at issue)
Siemens-Bendix Automotive Electronics L.P.
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.