US Patent 7341635 Eraser
Patent 7341635 was granted and assigned to Sakura Color Products Corporation on March, 2008 by the United States Patent and Trademark Office.
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An eraser is constituted by an elastic material containing a rubber component or a resin component, and a skeleton structure for reinforcing the elastic material, and the skeleton structure is made from a porous structural material such as from an organic polymer that is broken when rubbed. Void portions in the porous structural material of the skeleton structure contain the elastic material of the eraser composition. Here, the skeleton portions of the skeleton structure may have an average thickness of 1 to 100 μm, and the void portions may have an average pore size of 10 μm to 3 mm. The eraser may have a surface hardness of 50 to 80, and also a sticking strength of 1.5 to 20 (kgf).
US Patent 07341635 Eraser US Patent 7341635 Eraser
US Patent 07341635 Eraser
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