Granted Patent
Utility
US 4,382,707 · App. 06/237,803
Felt tip writing pen
Inventor:
Gerold Anderka
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Feb 24, 1981
Inventor
Gerold Anderka
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.