Granted Patent
Utility
US 6,816,690 · App. 10/355,620
Image forming apparatus and method of discharging waste toner
Inventor:
Akihiro Yamamura
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Jan 31, 2003
Inventor
Akihiro Yamamura
Assignee (at issue)
Oki Data Corporation
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.