Granted Patent
Utility
US 4,903,551 · App. 07/158,318
Failsafe hydraulic control system for vehicle automatic transmission
Inventors:
Takeo Hiramatsu, Tsunefumi Niiyama
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Feb 22, 1988
Inventors
Takeo Hiramatsu
Tsunefumi Niiyama
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.