The present disclosure concerns a water-based color-changing ink composition with two different states of color over time, an initial color A and then a second color B which is not colorless, comprising a volatile pH-modifier base capable of evaporating at room temperature (20° C.), a pH-sensitive dye, and an optional non-pH sensitive dye. The disclosure also concerns a method for preparing such color-changing ink composition. A writing instrument comprising such color-changing ink composition, and a kit comprising such color-changing ink composition and an eradicator, as well as methods for writing on a substrate, are also part of the disclosure. Finally, the disclosure aims at a substrate coated with a color-changing ink composition according to the disclosure.

The adaptation of a pocket-size pen for use by a person is provided. The pen includes a cap with internally configured male threads, and a body. The body includes a barrel with externally configured and spaced apart first set of female threads, and second set of female threads. The barrel is hollow inside with a top opening for receiving a full-sized standard ink source. The male threads of the cap engage the second set of female threads of the pen body for closing a writing tip and reducing the length of the pen for storage in the pocket of a user. The male threads of the cap engage the first set of female threads of the body for transforming the pen into an extended-length pen similar in length to a conventional pen and revealing the writing tip for comfortable writing using the pen.

The adaptation of a pocket-size pen for use by a person is provided. The pen includes a cap with internally configured male threads, and a body. The body includes a barrel with externally configured and spaced apart first set of female threads, and second set of female threads. The barrel is hollow inside with a top opening for receiving a full-sized standard ink source. The male threads of the cap engage the second set of female threads of the pen body for closing a writing tip and reducing the length of the pen for storage in the pocket of a user. The male threads of the cap engage the first set of female threads of the body for transforming the pen into an extended-length pen similar in length to a conventional pen and revealing the writing tip for comfortable writing using the pen.

A compact system to mix and create color materials is disclosed. The present invention generally related to a color creative system, in which a particular system is capable to create a final mix color of materials from multiple material reservoirs and dispensing the mixed color of material via applicator of choices, all in a single system that can be as small as a pen or a person's thumb or larger as desired. The system is manually operated.

A compact system to mix and create color materials is disclosed. The present invention generally related to a color creative system, in which a particular system is capable to create a final mix color of materials from multiple material reservoirs and dispensing the mixed color of material via applicator of choices, all in a single system that can be as small as a pen or a person's thumb or larger as desired. The system is manually operated.

An input system having at least one sensor board, at least one recording medium and at least one input device/stylus. The at least one sensor board is divided into at least two virtual sub-boards or the at least one sensor board is in the form of two separate sensor boards. The two sensor boards have, on at least one side edge, a structure for mutual fixing. A multi-page recording medium is arranged over the at least one sensor board. The at least one input device/stylus has an analogue application function. The at least one input device/stylus has a digital input function/signal function for sensor boards.

An input system having at least one sensor board, at least one recording medium and at least one input device/stylus. The at least one sensor board is divided into at least two virtual sub-boards or the at least one sensor board is in the form of two separate sensor boards. The two sensor boards have, on at least one side edge, a structure for mutual fixing. A multi-page recording medium is arranged over the at least one sensor board. The at least one input device/stylus has an analogue application function. The at least one input device/stylus has a digital input function/signal function for sensor boards.

An angle-adjustable, gravity flow ink refill and pen, each comprising of at least one bendable portion along its length. The bendable portion acts as a concertina-type hinge to allow both the pen and refill to bend to an angle and maintain the bend imparted to it. In a preferred embodiment, the refill is flexible in structure (full or partial) and the pen having a crimped corrugated bendable portion. In an alternate embodiment, intertwined helical wires form the bendable portion for the pen, the refill or both to maintain the angle bent. Alternatively a flexible gooseneck tube is used for the bendable portion of the pen. The pen writes normally on flat surfaces and on inclined surfaces, the rear end of the pen is bent forward such that the rear is pointed upwards towards the sky. This allows ink to flow towards the tip via gravity and facilitate consistent delivery of ink at multiple writing angles.

An angle-adjustable, gravity flow ink refill and pen, each comprising of at least one bendable portion along its length. The bendable portion acts as a concertina-type hinge to allow both the pen and refill to bend to an angle and maintain the bend imparted to it. In a preferred embodiment, the refill is flexible in structure (full or partial) and the pen having a crimped corrugated bendable portion. In an alternate embodiment, intertwined helical wires form the bendable portion for the pen, the refill or both to maintain the angle bent. Alternatively a flexible gooseneck tube is used for the bendable portion of the pen. The pen writes normally on flat surfaces and on inclined surfaces, the rear end of the pen is bent forward such that the rear is pointed upwards towards the sky. This allows ink to flow towards the tip via gravity and facilitate consistent delivery of ink at multiple writing angles.

Embodiments of the invention are directed to a roller ball marking instrument for use with paint, a method for assembling the roller ball marking instrument, and a system for delivering paint. The body of the marking instrument includes a reservoir for storing paint. The body is coupled to a fibrous roller ball via a retaining ring. The roller balls sits within a partially-enclosed cavity in the center of the retaining ring. A least part of the roller ball protrudes through an opening in the retaining ring. Paint in the reservoir moves first through an opening at one end of the body and then through an open center of the retaining ring. The paint is transferred to the roller ball. The roller ball rotates freely within the cavity of the retaining ring and transfers the paint to a writing surface.