Appeal No. 2001-2124
Application No. 09/416,914
THE INVENTION
The invention is directed to a method for coating inorganic particles. These particles
have a particle size of about 1 to 100 micrometers. The coating particles have a particle size
of about 1 to 100 nanometers, corresponding to 0.001 micrometers to 0.1 micrometers,
which surrounds the inorganic particles. The mixture is thereafter fired, separated from
uncoated inorganic particles and dried. Additional limitations are described in the following
illustrative claims.
THE CLAIMS
Claims 1, 8, 14 and 17 are illustrative of the appellant’s invention and are reproduced
below.
1. A method of coating inorganic particles comprising mixing inorganic particles having a
particle size of about 1 to 100 micrometers with a sufficient amount of coating particles
having a particle size of about 1 to 100 nanometers to surround said inorganic particles,
firing the mixture at a temperature high enough to soften or melt the coating particles,
thereby encapsulating the micrometer-sized particles, but at a temperature low enough so that
the surface properties of the micrometer-sized particles remain unchanged,
separating out any uncoated micrometer-sized particles by reacting or dissolving them
in a solvent, and
drying the coated particles.
6. A method according to claim 5 wherein the phosphor is a europium activated
strontium sulfide phosphor.
8. A method according to claim 6 wherein the phosphor is a europium activated calcium
2
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