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US 2025/0115072 A1Published application
Writing implement refill and method of engraving writing implement refill
AssigneeMitsubishi Pencil Company, Limited
InventorsYutaka ONODERA, Atsushi NAKASHIMA
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Abstract
A writing implement refill includes: an ink storage tube made of a synthetic resin, an inside of the ink storage tube being visible; and an engraved mark, on a surface of the ink storage tube, formed by the synthetic resin being foamed or carbonized or both.
Claims10
A writing implement refill, comprising:
- an ink storage tube made of a synthetic resin, an inside of the ink storage tube being visible;
- and
- an engraved mark formed, on a surface of the ink storage tube, by the synthetic resin being foamed or carbonized or both.
Dependencies are inferred from the claim text.