Appeal No. 97-2909
Application No. 08/332,317
DECISION ON APPEAL
This is an appeal from the final rejection of claims 1 to
21, all the claims in the application.
The invention in issue is summarized on page 3 of
appellants’ brief as follows:
The invention is an arc tube with a visible-
light-transparent film which is coated on the
cold regions of the arc tube but not on the hot
regions. The film transmits visible radiation
and absorbs ultraviolet radiation emitted by the
arc to impose an additional heat load on the
cold regions so that the metal halides will not
condense and so that a high metal halide vapor
pressure can be maintained. The transparent
film is not coated on the hot regions, since
additional heat load at the hot regions would be
detrimental. The transparent film also reflects
infrared radiation emitted by the arc tube back
to the arc to increase efficiency and further
increase the temperature of the cold region due
to decreased thermal emittance. The transparent
film is preferably a dichroic coating having
alternating layers of high and low index of
refraction refractory materials.
The appealed claims are reproduced in the appendix of
appellants’ brief.
The references applied in the final rejection are:
Meulemans et al. (Meulemans) 4,307,315 Dec.
22, 1981
Parham et al. (Parham) 4,949,005 Aug. 14,
1990
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