Granted Patent
Utility
US 6,105,367 · App. 09/077,468
Hydraulic drive system
Inventors:
Yasutaka Tsuruga, Takashi Kanai, Junya Kawamoto
Patented Case
View Patent ↗
Granted: Aug 22, 2000
Filed: May 29, 1998
Inventors
Yasutaka Tsuruga
Takashi Kanai
Junya Kawamoto
Assignee (at issue)
HITACHI CONSTRUCTION MACHINERY 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.