Appeal No. 2003-1246
Application 08/393,617
(Specification at 1, ll. 6-8). Appellants' Figure 1 shows one
end of a prior art electrical device 10, such as a tungsten
halogen lamp.
The figure shows a body 11 formed of fused silica or quartz or
some other high silica content glass, an electrically conductive
member 12 having a proximal portion 14, an intermediate thin foil
portion 16 (e.g., molybdenum) for forming a hermetic seal with
body 11, and a distal portion 18, which extends out of body 11
(Specification at 3, ll. 8-20). As noted in Appellants'
specification (at 3, ll. 26-27), in order to prevent oxidation of
molybdenum foil 16 at elevated temperatures it has been proposed
to use solder glass 22 to fill the capillary passage 20 between
distal portion 18 and body 11. While lead borate glass has been
suggested for this purpose, "the use of such a glass requires the
use of platinum or platinum clad lead-wires since lead borate
2
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