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US 12,325,255 B2Granted
Writing instrument
AssigneeMitsubishi Pencil Company, Limited
InventorsToshimi Kamitani, Chihiro Mochizuki, Wataru Sagawa
Life of this patent
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Abstract
A writing instrument in which condensation does not occur in a cap even though the writing instrument is equipped with the cap and which has high writing instrument quality and commercial value. The writing instrument includes at least a barrel in which an aqueous ink is contained; a pen tip provided on a tip side of the barrel and capable of discharging the aqueous ink; and a cap that is removably attached on a pen tip side of the barrel, wherein the aqueous ink has a vapor pressure of 10.3 to 12.3 kPa at 50° C.
Claims5
A writing instrument comprising at least:
- a barrel in which an aqueous ink is contained;
- a pen tip provided on a tip side of the barrel and capable of discharging the aqueous ink;
- and
- a cap that is removably attached on a pen tip side of the barrel, wherein
- the aqueous ink has a vapor pressure of 10.3 to 12.3 kPa at 50° C.
2 more elements
Dependencies are inferred from the claim text.