Granted Patent
Utility
US 6,580,881 · App. 09/970,829
Method of detecting waste toner in a container of an image forming apparatus
Inventors:
Matthew Christopher Coriale, Jonathan C. Frey, Harald Portig, John Parker Richey, Wen-hsiung Adam Tseng, Liqun Larry Wang
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Oct 4, 2001
Inventors
Matthew Christopher Coriale
Jonathan C. Frey
Harald Portig
John Parker Richey
Wen-hsiung Adam Tseng
Liqun Larry Wang
Assignee (at issue)
Lexmark International, Inc.
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.