Granted Patent
Utility
US 4,478,182 · App. 06/490,339
Helically-shaped intake port of an internal combustion engine
Inventors:
Kiyoshi Nakanishi, Takeshi Okumura, Mutsumi Kanda, Takeshi Kotani, Tokuta Inoue
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: May 2, 1983
Inventors
Kiyoshi Nakanishi
Takeshi Okumura
Mutsumi Kanda
Takeshi Kotani
Tokuta Inoue
Assignee (at issue)
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.