Patent ID: 7004661
Filing Date: 2006-02-28
Classification: B43K,B43M

Abstract:
1. Ballpoint pen ( 1 ) nib ( 2 ) housing a ball ( 3 ) and having a stem ( 6 ), at least one part of which is inserted coaxially into a hole ( 5 ) in the lower end ( 4 f ) of a hollow barrel ( 4 ) forming part of the ballpoint pen ( 1 ), wherein on the outer surface of the at least one part of the stem are formed one or more flutes ( 7 i ) that extend parallel to the longitudinal axis (Z—Z) of the stem ( 6 ) for a length (L) equal to or greater than the axial length (H) of the hole ( 5 ) in such a way that opposite ends (D, E) of the flutes ( 7 i ) are on opposite sides with respect to the hole; and at least two (