Granted Patent
Utility
US 5,309,592 · App. 08/076,754
Cleaning robot
Inventor:
Kazuhiro Hiratsuka
Patented Case
View Patent ↗
Granted: May 10, 1994
Filed: Jun 15, 1993
Inventor
Kazuhiro Hiratsuka
Assignee (at issue)
SANYO ELECTRIC 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.