Granted Patent
Utility
US 4,540,993 · App. 06/633,172
Plotter pen
Inventors:
Charles Gunderson, Aftab H. Kapadya
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jul 23, 1984
Inventors
Charles Gunderson
Aftab H. Kapadya
Assignee (at issue)
Sanders GmbH
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.