A marking instrument having a plurality of removable writing nibs serially aligned so that an operator can remove a spent or fluid-affected writing nib and, thereby, access a fresh writing tip.

A marking instrument having a plurality of removable writing nibs serially aligned so that an operator can remove a spent or fluid-affected writing nib and, thereby, access a fresh writing tip.

Aspects determine optimal physical attribute values for defining a grip form factor on a microfluidic grip panel of a digital pen as a function of a correlation of the optimal physical attribute values to an intended use of the digital pen, wherein the optimal physical attribute values include a width dimension, a surface texture attribute, and shape pattern attribute that is defined as a function of the width dimension; and drive the microfluidic grip panel into a grip form corresponding to the determined optimal physical attribute values during use of the digital pen by a user.

A writing utensil safety sheath comprising a body having a first open end and an internal channel. The internal channel is sized to retain at least a portion of a writing utensil in either a first extended position or a retracted position. The writing utensil safety sheath also has a grip affixed to and extending beyond the first open end of the body. The grip contacts a writing end of the writing utensil when the writing utensil is in the first extended position thus retaining the writing utensil in the first extended position while writing. When a force applied to the writing end exceeds a predetermined amount, the writing utensil retracts back into the body by sliding through the grip into the first open end of the body.

A writing utensil safety sheath comprising a body having a first open end and an internal channel. The internal channel is sized to retain at least a portion of a writing utensil in either a first extended position or a retracted position. The writing utensil safety sheath also has a grip affixed to and extending beyond the first open end of the body. The grip contacts a writing end of the writing utensil when the writing utensil is in the first extended position thus retaining the writing utensil in the first extended position while writing. When a force applied to the writing end exceeds a predetermined amount, the writing utensil retracts back into the body by sliding through the grip into the first open end of the body.

A writing utensil adapted for promoting the development of a tripod writing grip includes an elongate body having a substantially polygonal cross section, and having three faces extending between a proximal end and a distal end thereof, and a boss member extending from an intermediate portion of the elongate body, the boss member being adapted for impeding a user's fingers from sliding along a longitudinal axis of the elongate body.

A writing utensil adapted for promoting the development of a tripod writing grip includes an elongate body having a substantially polygonal cross section, and having three faces extending between a proximal end and a distal end thereof, and a boss member extending from an intermediate portion of the elongate body, the boss member being adapted for impeding a user's fingers from sliding along a longitudinal axis of the elongate body.

The invention refers to a pen with a shaft, a gripping zone, and a measuring device having a sensor, the measuring device measuring a force acting on the gripping zone. According to the invention, a cover is provided in the area of the gripping zone, said cover covering the measuring device on the outside.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.