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US 4,287,146 AGranted
Nib-type writing pen and method of manufacture
OwnerYoshio Midorikawainventor
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Abstract
A nib-type writing pen is formed by compressing a plurality of fibers into a bundle, extruding a plastic sheath around the fiber bundle, cutting the sheathed fiber bundle to a suitable length and injecting a urethane prepolymer into one or both ends of the cut and sheathed fiber bundle.
Claims6
A method of manufacturing a writing pen having a completely integral writing nib portion and ink reservoir, comprising the steps of:
- passing fibers through a die to compress and form them into a fiber bundle;
- extruding a plastic sheath around said fiber bundle;
- cutting the sheathed fiber bundle thus formed into a predetermined length;
- injecting urethane prepolymer liquid under pressure into either or both ends of the cut and sheathed fiber bundle to impregnate same;
- allowing the urethane polymer to harden;
- and
- machining the impregnated end portions to a suitable shape.
4 more elements
Dependencies are inferred from the claim text.