Granted Patent
Utility
US 4,990,964 · App. 07/348,668
Toner delivery system having a multi-functional toner container for non-mechanical printer and copier means
Inventor:
Erich Kraehn
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Mar 24, 1989
Inventor
Erich Kraehn
Assignee (at issue)
Siemens Aktiengesellschaft
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.