Granted Patent
Utility
US 4,864,355 · App. 07/221,741
Apparatus for the production of photographic copies
Inventors:
Hugo Knecht, Rene Luscher
Patented Case
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Granted: Sep 5, 1989
Filed: Jul 20, 1988
Inventors
Hugo Knecht
Rene Luscher
Assignee (at issue)
Ciba-Geigy
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.