A reusable envelope has one or more spaces thereon where address, return labels and/or postage can be removably placed or permanently affixed such as for finite number of shipments using a permanently affixed postage area, for example. The reusable envelope also includes a resealable closure allowing the interior of the envelope to be closed and reopened multiple times for multiple uses (shipments, receiving) or optionally to use a finite number of times by exposing the permanent adhesive to the flat and mating surface depending on user preference.

A reusable envelope has one or more spaces thereon where address, return labels and/or postage can be removably placed or permanently affixed such as for finite number of shipments using a permanently affixed postage area, for example. The reusable envelope also includes a resealable closure allowing the interior of the envelope to be closed and reopened multiple times for multiple uses (shipments, receiving) or optionally to use a finite number of times by exposing the permanent adhesive to the flat and mating surface depending on user preference.

The present disclosure relates to one-pot, water-based/waterborne dry erasable paints, anti-graffiti paints, and surfaces. The dry erasable paints can be used to create dry erase coatings on virtually any type of substrate surface. The paints comprise an Si-containing compound, water, and an ingredient selected from the group consisting of binders, acids, salts, surfactants, and glycerin, and create a dry surface where the flexibility, adhesion, dye resistance, and chemical resistance best matches the substrate and use.

The present disclosure relates to one-pot, water-based/waterborne dry erasable paints, anti-graffiti paints, and surfaces. The dry erasable paints can be used to create dry erase coatings on virtually any type of substrate surface. The paints comprise an Si-containing compound, water, and an ingredient selected from the group consisting of binders, acids, salts, surfactants, and glycerin, and create a dry surface where the flexibility, adhesion, dye resistance, and chemical resistance best matches the substrate and use.

An electronic information board apparatus includes: a guide generating unit configured to display a handwriting region on a screen; a coordinate detecting unit configured to detect coordinates of an indication body moving in the handwriting region on the screen; an image drawing unit configured to generate a stroke image based on the coordinates and display the generated stroke image in the handwriting region on a first layer of the screen; a character recognizing unit configured to execute character recognition based on a hand-written image that is hand-written inside the handwriting region and outputs text data; and a display superimposing unit configured to display the text data acquired from the character recognizing unit at a position that is approximately the same as that of the hand-written image that is hand-written inside the handwriting region on the screen, and on a second layer of the screen different from the first layer.

The present invention relates to a metal-sheet board or blackboard with magnetic features having two or three movements, which plots and represents reality in four dimensions (horizontal, vertical, depth and time) and which describes reality objectively, in which a T-shaped ruler is moved on a rail along the horizontal or X axis by a digital stepper motor controlled by a driver and software on the computer (horizontal movement). Furthermore, a tool truck surrounding the T-shaped ruler moves along the entire length (vertical movement) or Y axis thereof, actuated by a digital stepper motor controlled by a driver, which is in turn controlled by software on the computer, with these two movements controlled by mathematical speed and acceleration functions.

A magnetic display unit includes: a display layer; a magnetic layer located behind the display layer; and a quick-release mechanism including an activator, wherein the quick-release mechanism is adapted to increase the distance between the magnetic layer and the display layer such that, when activated by the activator, the quick-release mechanism causes any magnets located along the display layer to be released from the display layer.

The present invention provides tablets with interconnection features and a system of multiple tablet assemblies removably interconnected to one another. The tablets may be removably mounted to a vertical surface or positioned on a horizontal surface. Features of the present invention allow a user to remove or move one tablet from the system without disrupting or moving the other tablets.

The present invention provides tablets with interconnection features and a system of multiple tablet assemblies removably interconnected to one another. The tablets may be removably mounted to a vertical surface or positioned on a horizontal surface. Features of the present invention allow a user to remove or move one tablet from the system without disrupting or moving the other tablets.

Disclosed is a system for detecting and calibrating coordinates of infrared touch pen for electronic blackboard. According to the embodiment of the present invention, a system for detecting and calibrating coordinates of infrared touch pen for electronic blackboard includes a laser irradiation unit for irradiating a laser pointer to a predetermined Region 1, a camera photographing unit photographing the Region 1 and display panel, an image analysis unit that analyzes image data captured by the camera photographing unit and determines detection of an infrared touch pen, a touch pen detection unit calculating coordinate information of the infrared touch pen when the infrared touch pen is detected by the image analysis unit, and a coordinate calibration unit for calibrating the coordinate information calculated based on the image data analyzed by the image analysis unit.