US 12,138,951 B1
Writing instrument for erasing handwritten content
Young Saeng Park, Busan (KR); and Bae Jo Park, Busan (KR)
Assigned to CROWN BALLPEN CO., LTD., Gyeongsangnam-do (KR)
Filed by CROWN BALLPEN CO., LTD., Gyeongsangnam-do (KR)
Filed on Oct. 5, 2023, as Appl. No. 18/376,868.
Claims priority of application No. 10-2023-0077904 (KR), filed on Jun. 19, 2023.
Int. Cl. B43K 7/00 (2006.01); B43K 7/12 (2006.01); B43K 29/02 (2006.01); B43L 19/00 (2006.01)
CPC B43K 7/005 (2013.01) [B43K 7/12 (2013.01); B43K 29/02 (2013.01); B43L 19/0025 (2013.01); B43L 19/0056 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A writing instrument having a removal function of a handwritten content, comprising: a housing having a hollow tub shape; an ink filling tube containing an adhesive ink inside the housing; a ballpoint pen tip making the adhesive ink flow on paper P to write words W; and a knock cap ascending or descending the ink filling tube and the ballpoint pen tip in a vertical direction,
wherein, a lower body of the housing consists of a single tube, and forms a tip erasing body onto an outer surface of the lower body;
the tip erasing body is a part of the lower body, and is formed by double injection mold on the outer surface of the lower body, resulting in a single integrated body with the lower body;
a first synthetic resin component of the tip erasing body forms a chemical bond with a second synthetic resin component of the lower body, while the tip erasing body is bonded to the outer surface of the lower body, wherein the first synthetic resin component of the tip erasing body is made of a hard compound resin; and
wherein the tip erasing body does not contain any form of gap when forming a binding relationship with the lower body.