Granted Patent
Utility
US 4,633,840 · App. 06/690,502
Method for controlling air-fuel ratio in internal combustion engine
Inventors:
Tsutomu Saito, Tsuneyuki Egami, Tokio Kohama, Kimitaka Saito, Hiroshi Takahashi, Kunihiko Sato
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Jan 10, 1985
Inventors
Tsutomu Saito
Tsuneyuki Egami
Tokio Kohama
Kimitaka Saito
Hiroshi Takahashi
Kunihiko Sato
Assignees (at issue)
NIPPON SOKEN, INC.
TOYOTA JIDOSHA 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.