Projection blackboard

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8470451
APP PUB NO 20090155759A1
SERIAL NO

12065510

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A projection blackboard having both of an excellent blackboard function and an excellent screen function, and a process for producing the same. The surface enamel layer that is an outermost layer of the enamel layers is formed by using a enameling upper glaze wherein at least titanium oxide coated particles, or a titanium oxide glaze together therewith is blended into a. transparent mat glaze, so as to render the layer an enamel layer having a predetermined color tone, a surface characteristic that the Rz is from 5 to 25 μm and a reflective characteristic that the peak gain is 0.28 or more, or having these properties and a glossiness Gs(75°)of 1 to 30%. This makes it possible to produce a blackboard excellent in both of blackboard function and screen function. The titanium oxide coated particles are preferably particles wherein surfaces of mica particles are coated with titanium oxide.

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Patent Owner(s)

  • JFE METAL PRODUCTS & ENGINEERING INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayashi, Kazuhiro Tokyo, JP 194 1578

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