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US 12,090,777 B2Granted
Writing instrument refills and writing instrument
AssigneeKotobuki & Co., Ltd.
InventorsHidehei Kageyama, Toshikazu Sasaki
Life of this patent
Estimating the term…
Abstract
In one embodiment, a writing instrument refill includes a first portion having flexibility, and a second portion having a cross-sectional area larger than a cross-sectional area of the first portion, wherein the center of figure of the cross section of the first portion is offset from the center of the figure of the cross section of the second portion, the first portion and the second portion are formed integrally, and a part of the first portion has an outer diameter smaller than an outer diameter of the other part of the first portion.
Claims14
A writing instrument refill, including:
- a first portion having flexibility;
- and
- a second portion having a cross-sectional area larger than a cross-sectional area of the first portion,
- wherein a center of figure of a cross section of the first portion is offset from a center of figure of a cross section of the second portion,
- the first portion and the second portion are formed integrally, and a part of the first portion has an outer diameter smaller than an outer diameter of other part of the first portion,
- wherein the cross-sectional area of the second portion is configured to increase from the offset center of figure of the cross section of the first portion toward the center of figure of the cross section of the second portion.
3 more elements
Dependencies are inferred from the claim text.