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The object is to provide a writing instrument in which a large-diametric ink retaining portion with narrow grooves in width and still capable of securing a large enough air channel can be formed so that the replacement of the sufficient amount of air can ...
|6247866||Feeding ducts for writing liquids in fountain pen nibs, and a method of producing same|
A feeding duct for writing liquid in fountain pen nibs and method of producing same, wherein the duct includes a substantially cylindrical element having multiple circumferential grooves creating respective fins, of a support for a nib and a connecting ma...
|5927886||Direct ink storaging type writing implement|
A longitudinal groove which allows a number of annular grooves formed on the outer peripheral surface of an ink storage body to communicate with an ink chamber is cut halfway into the thickness of a flange formed at the rear part of the ink storage body. ...