Roller ball pen for pigmented inks

Details Roller ball pen for pigmented inks Roller ball pen for pigmented inks

2006-05-02

2006-05-02

Walczak, David J. (Department: 3751)

Coating implements with material supply

With means to agitate material in reservoir

C401S209000, C401S217000

Reexamination Certificate

active

07037015

ABSTRACT:
A free ink roller ball pen for dispensing low viscosity inks containing pigments that are prone to sedimentation. The instrument contains an ink reservoir chamber, a nib chamber provided with a roller ball socket assembly, a pressure equalization overflow chamber for the low viscosity ink, and a special agitation system for the ink reservoir and nib chamber. The agitation system comprises a weight, with a cross section smaller than the interior of the nib chamber, connected to a wire having a diameter smaller than the back inner diameter of the ball socket assembly. The length of the weight and its confinement are selected to provide for a predetermined stroke, on shaking the pen, that sweeps out the internal space of the nib and also the back of the roller ball assembly, to re-disperse any pigment that has precipitated.

REFERENCES:
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patent: 5688061 (1997-11-01), Aoki
patent: 6536969 (2003-03-01), Nishitani
patent: 6755587 (2004-06-01), Fukushima

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