Appeal No. 2003-1932 Page 2
Application No. 09/436,179
the separated coated material. Appealed claim 5 is reproduced
below.
5. A method of providing a luminescent material with a
coating comprising magnesium oxide MgO, said method
comprising:
forming an aqueous suspension of the luminescent
material, forming an aqueous solution of a water-soluble
magnesium salt, adding the solution of the water-soluble
magnesium salt to the suspension of the luminescent
material, the thereby modified suspension having a pH of
about 7, increasing the pH of the suspension to about 9.5
thereby forming a homogeneous precipitate of magnesium
hydroxide Mg (OH)2 on the luminescent material, separating
the resultant magnesium hydroxide coated luminescent
material from the suspension, then calcinating the magnesium
hydroxide coated luminescent material.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Tamatani et al. (Tamatani) 5,289,081 Feb. 22, 1994
Bruno et al. (Bruno) 5,382,452 Jan. 17, 1995
Claim 5 stands rejected under 35 U.S.C. § 103(a) as being
unpatentable over Tamatani in view of Bruno.
We refer to the brief and reply brief and to the answer for
a complete exposition of the opposing viewpoints expressed by
appellants and the examiner concerning the issues before us on
this appeal.
OPINION
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