A slide-type writing instrument having a drying-prevention device includes: a pen housing (10); an ink holder (30) disposed in the pen housing (10); a sealing member (40) configured to prevent a drying phenomenon of ink on a pen tip (31); a spring (50) configured to effect elastic support between the sealing member (40) and the ink holder (30); a guide member (60) configured to guide the sealing member (40) when the ink holder (30) is advanced or retreated; and a cam protrusion (70) configured to be responsible for a guiding function of moving the guide member (60). The sealing member includes a soft tube formed of a soft material and a hard tube formed of a hard material and in the shape of a hollow tube to externally surround the soft tube, and the soft tube and the hard tube form a dual cross-section structure.

Dry erase ink formulations containing a resin, a pre-assembled colorant, and a solvent, wherein the dry erase ink formulation has a surface tension of at least 25 dynes per centimeter, and writing instruments including a dry erase ink formulation are provided herein.

A slide-type writing instrument having a drying-prevention device includes: a pen housing (10); an ink holder (30) disposed in the pen housing (10); a sealing member (40) configured to prevent a drying phenomenon of ink on a pen tip (31); a spring (50) configured to effect elastic support between the sealing member (40) and the ink holder (30); a guide member (60) configured to guide the sealing member (40) when the ink holder (30) is advanced or retreated; and a cam protrusion (70) configured to be responsible for a guiding function of moving the guide member (60). The sealing member includes a soft tube formed of a soft material and a hard tube formed of a hard material and in the shape of a hollow tube to externally surround the soft tube, and the soft tube and the hard tube form a dual cross-section structure.

There is a non-thermochromic irreversible color changing aqueous writing ink including core-shell dye microparticles and a coloring agent, in which the core of the core-shell dye microparticles includes an organic solvent immiscible with water and at least one dye soluble in the organic solvent and the shell includes a resin component. There also is a writing instrument containing it and the process of preparation of this ink.

A writing instrument includes a body, a nosecone, and an adaptor each being of generally hollow tubular shape. The body, the nosecone, and the adaptor each have a first end and a second end. The first end of the adaptor is configured to slidably couple to the nosecone second end. The second end of the adaptor is coupled to the first end of the body. The writing instrument includes a writing element with a mounting end and a writing end where the mounting end is removably coupled to the second end of the body. The writing instrument includes a locking mechanism configured to selectively lock the nosecone in a storage position or a writing position. In the storage position, the nosecone extends and covers the writing end. In the writing position, the nosecone retracts and the writing end of the writing element extends beyond the nosecone.

Provided is a pen including: an ink reservoir that stores an ink including decorative particles and a pen tip section. The ink reservoir includes a tubular casing member having liquid blocking properties and an ink occlusion material disposed inside the casing member. The casing member has a first opening end and a second opening end. The ink occlusion material includes multiple fibers disposed in the casing member and the multiple fibers respectively having one ends and other ends each disposed at a position corresponding to the first opening end or the second opening end of the casing member.

A multi-purpose combination writing instrument comprising: at least three individual writing instruments, each individual writing instrument comprising a barrel having a proximal end and a distal end; a base having opposing first and second ends, the first end of the base comprising at least three receivers, wherein each receiver is adapted to receive the proximal end of the barrel of a corresponding individual writing instrument, and the second end of the base having at least three tape flag platforms disposed therein; and a cap rotatably mounted on the second end of the base over the at least three tape flag platforms, wherein an opening in the cap provides access to one tape flag platform at a time as it rotates around the second end of the base.

A thermochromic ink writing instrument comprising a body extending along an axis, the body having a first end and a second end opposed to the first end along the axis, the first end being provided with a writing tip and with an eraser, wherein the writing tip is fed with thermochromic ink, wherein the writing tip is fixed with regard to the body and the eraser is movable along the axis with regard to the body, and the thermochromic ink writing instrument further comprising a helical-cam propelling mechanism configured to move the eraser along the axis between a retracted position and a protruding position.

An erasable ink writing instrument comprising a body extending along an axis, the body having a first end and a second end opposed to the first end along the axis, the first end being provided with a writing tip and with an eraser, wherein the writing tip is fed with erasable ink, wherein the writing tip is fixed with regard to the body and the eraser is movable along the axis with regard to the body, and the erasable ink writing instrument further comprising a helical-cam propelling mechanism configured to move the eraser along the axis between a retracted position and a protruding position. The erasable ink is a peelable ink and the eraser is a friction body.

The writing instrument includes a body, a nosecone, and an adapter. The body, nosecone, and adapter each include a generally hollow tubular shape and an inner surface, outer surface, first end, and second end. The first end of the adapter is coupled to the second end of the nosecone. The second end of the adapter is configured to slidably couple to the first end of the body. The writing instrument includes a writing element with a mounting end and a writing end. The mounting end of the writing element is removably coupled to a second end of the body. The adapter includes a track and the track includes a recessed channel in the outer surface of the adapter. The body includes at least one protrusion that extends inwards from the inner surface of the body. The protrusion slidably engages with the track of the adapter.