Granted Patent
Utility
US 4,489,333 · App. 06/508,683
Device for exchanging objects in particular writing instruments
Inventors:
Gerold Anderka, Joachim Brandt, Gerhard Deblitz, Rolf Martens, Rolf Paschen, Jurgen Post, Bernd Willimczik
Patented Case
View Patent ↗
Granted: Dec 18, 1984
Filed: Jun 28, 1983
Inventors
Gerold Anderka
Joachim Brandt
Gerhard Deblitz
Rolf Martens
Rolf Paschen
Jurgen Post
Bernd Willimczik
Assignee (at issue)
Koh-I-Noor Rapidograph, 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.