Granted Patent
Utility
US 5,192,973 · App. 07/473,950
Covering and cleaning device for the optical character generator in an electrophotographic printing device
Inventor:
Gerhard Hickisch
Patented Case
View Patent ↗
Granted: Mar 9, 1993
Filed: Feb 13, 1990
Inventor
Gerhard Hickisch
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.