The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2021
Filed:
Mar. 19, 2018
Mitsubishi Pencil Company, Limited, Tokyo, JP;
Takayuki Ikai, Yokohama, JP;
MITSUBISHI PENCIL COMPANY, LIMITED, Tokyo, JP;
Abstract
A refill for writing implements has an ink reservoir tube () made of resin material and formed to be a straight cylinder and a writing tip () attached to one end of the ink reservoir tube (), and a value of an expression of D−(D−2t)is selected to be 45 or greater, where D denotes an outer diameter of the ink reservoir tube () and t denotes a thickness of the ink reservoir tube (). It is possible to secure the necessary storage amount of ink in the ink reservoir tube () without increasing the outer diameter thereof, and is also possible to provide a refill for a writing implement and a writing implement which allow one to keep writing comfortably without feeling of discomfort in writing.