Granted Patent
Utility
US 4,457,613 · App. 06/369,832
Mixing device for blending a developer consisting of carrier particles and toner
Inventors:
Walter Kopp, Karl-Heinz Saalmueller
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Apr 19, 1982
Inventors
Walter Kopp
Karl-Heinz Saalmueller
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.