Granted Patent
Utility
US 4,834,051 · App. 07/166,968
Oxygen sensor and an air-fuel ratio control apparatus of an internal combustion engine using the same
Inventors:
Masahi Tanaka, Shigekazu Yamauchi, Masaru Mikita
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Mar 11, 1988
Inventors
Masahi Tanaka
Shigekazu Yamauchi
Masaru Mikita
Assignee (at issue)
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
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.