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US 2014/0213442 A1Published application
Thermochromic coloring pad
AssigneeChromatic Technologies, Inc.
InventorsTerrill Scott Clayton, Timothy J. Owen
Life of this patent
Estimating the term…
Abstract
A children's coloring pad may incorporate thermochromic pigments that are specially formulated to develop color and clear color by respective applications of cold and hot temperatures. The pad may be used in a similar manner as with respect to finger painting, but without the residual mess.
Claims13
A thermochromic coloring pad, comprising:
- a sheet made of synthetic resin supporting a thermochromic material,
- the thermochromic material having a color activation temperature above 0° C. and a color deactivation temperature of less than human body temperature, whereby the thermochromic material is selectively activatable such that
- the sheet may be cooled to full color activation whereupon a subtraction image may be drawn on the sheet by contacting the sheet with human fingers, and
- the sheet may be heated to a point above the color deactivation temperature whereupon a positive image may be drawn on the sheet by contacting the sheet with a writing instrument that is chilled to a temperature less than the color activation temperature.
1 more element
A writing instrument comprising:
- a housing that provides a sidewall defining
- an interior chamber of constant dimension in an axial direction,
- a cap extending transversely to the axial direction, and
- an open end remote from the cap;
- a screw assembly retained by the cap and extending axially therethrough into the interior chamber;
- and
- a diaphragm mounted in the interior chamber,
- the diaphragm being engaged with the screw assembly such that selective rotation of the screw assembly moves the diaphragm axially within the interior chamber.
5 more elements
Dependencies are inferred from the claim text.