Granted Patent
Utility
US 4,958,553 · App. 07/341,357
Hydraulic controller
Inventor:
Katsumi Ueno
Patented Case
View Patent ↗
Granted: Sep 25, 1990
Filed: Apr 20, 1989
Inventor
Katsumi Ueno
Assignee (at issue)
Diesel Kiki Co., Ltd.
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.