Granted Patent
Utility
US 5,133,300 · App. 07/633,362
Backpack type operating unit
Inventor:
Takashi Miura
Patented Case
View Patent ↗
Granted: Jul 28, 1992
Filed: Dec 28, 1990
Inventor
Takashi Miura
Assignee (at issue)
Komatsu Zenoah Co.
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.