Patent ID: 7465117
Filing Date: 2008-12-16
Classification: B43K

Abstract:
1. A ball ( 1 ) of a pen tip ( 9 ) being from D 700×10 −6 to 2500×10 −6 in diameter and comprising at least one sign ( 2 ) engraved in the surface thereof, characterized in that the sign ( 2 ) is constituted by a system of engraved individual cells ( 3 ) situated on the surface of a spherical cap of the ball ( 1 ) with a base having a circumference OD in the range from 10×10 −6 m to 0.5 πD and the diameter Dc of the circle circumscribing the plan view shape of the cell ( 3 ) is in the range from 10×10 −6 m to 1/7 D, whereby the depth of the cell ( 3 ) is in the range from 10×10 −6 m to 2×Dc.