Pressurized roller pens and inks for such pens
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 6, 1988
Issued Date -
N/A
app pub date -
Oct 20, 1986
filing date -
Mar 3, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pressurized roller pen includes a thixotropic viscoelastic ink that is a gel at rest, but becomes a thin liquid under the shearing action of the pen's revolving ball-point. This ink includes a polyacrylic resin polymer, at least one highly polar solvent, at least one solvent of low or medium polarity, and colloidal silica, together with pigments, dyes, surfactants and/or pH modifiers.
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Cited Art Landscape
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