Granted Patent
Utility
US 6,493,521 · App. 09/778,894
Image forming apparatus
Inventors:
Toshio Miyamoto, Hiroto Hasegawa, Satoru Izawa, Masahiko Suzumi
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Feb 8, 2001
Inventors
Toshio Miyamoto
Hiroto Hasegawa
Satoru Izawa
Masahiko Suzumi
Assignee (at issue)
CANON KABUSHIKI KAISHA
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.