Granted Patent
Utility
US 6,256,464 · App. 09/517,591
Electrophotography apparatus
Inventor:
Michio Sumiyoshi
Patented Case
View Patent ↗
Granted: Jul 3, 2001
Filed: Mar 3, 2000
Inventor
Michio Sumiyoshi
Assignee (at issue)
HITACHI, 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.