Granted Patent
Utility
US 4,704,797 · App. 06/898,190
Drawing device for use in a drafting machine and a drawing pencil used therewith
Inventor:
Kenichiro Iai
Patented Case
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Granted: Nov 10, 1987
Filed: Aug 20, 1986
Inventor
Kenichiro Iai
Assignee (at issue)
Yoshida Kogyo K.K.
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.