Piccardi
{{PatentInfo |Inventor=William B. Reynolds |Assignee=The Parker Pen Company |Country=US |ApplicationNum=650140 |ApplicationDate=1946-02-25 |PatentNum=2417861 |PatentDate=1949-11-29 |PriorityDate=1946-02-25 |Titolo=Stable blue writing ink and a dye ther...