Appeal No. 96-2985
Application No. 08/332,620
The disclosed invention relates to a cathode having a
matrix body impregnated with an alkaline earth compound, and a
two-layer top coat on the surface of the matrix body. The
layer in contact with the matrix body consists essentially of
scandium and a high melting point metal, and the top layer is
a metallic sealing layer that consists essentially of a high
melting point metal.
Claim 10 is the only independent claim on appeal, and it
reads as follows:
10. A cathode having a matrix body impregnated with an
alkaline earth compound, a top coat on the surface of the
body, the top coat comprising a high melting point metal,
characterized in that the coat comprises at least first and
second layers, each of different chemical composition, the
first layer, in contact with the body, consisting essentially
of scandium and a high melting point metal, the second layer
being a metallic sealing layer consisting essentially of a
high melting point metal.
The references relied on by the examiner are:
Thomas et al. (Thomas) 4,101,800 Jul. 18,
1978
Watanabe et al. (Watanabe) 4,855,637 Aug. 8,
1989
Hasker et al. (Hasker) 5,006,753 Apr. 9,
1991
Claims 3 and 10 stand rejected under 35 U.S.C. § 103 as
being unpatentable over Watanabe.
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