Granted Patent
Utility
US 6,549,731 · App. 09/644,070
Image forming apparatus
Inventors:
Tomofumi Yoshida, Masahiko Saito, Akira Sasaki, Koichi Sato, Satoshi Narita, Yoshitaro Ishii
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Aug 23, 2000
Inventors
Tomofumi Yoshida
Masahiko Saito
Akira Sasaki
Koichi Sato
Satoshi Narita
Yoshitaro Ishii
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.