Appeal No. 96-2391
Application 08/002,286
This is a decision on the appeal under 35 U.S.C. § 134
from the examiner's rejection of claims 1-20, which constitute
all the claims in the application.
The claimed invention pertains to a cathode sheath for
use in a thermionic electron-gun cathode.
Representative claim 1 is reproduced as follows:
1. A cathode sheath for a thermionic electron-gun cathode,
the sheath being substantially in the form of a hollow cylinder
having an outer surface and an inner surface, a central axis, a
closed end and an axially-opposite open end, and a side wall
extending between the closed end and the open end, the sheath
comprising a continuous bimetallic laminate having a first layer
of material forming the inner surface and a second layer of
electron-emissive material overlying substantially the entirety
of the first layer and forming the outer surface, the laminate
having a preselected thickness at the closed end and having a
thickness at the side wall which varies along the central axis.
The examiner relied on the following references in the
final rejection:
Larson 3,214,626 Oct. 26, 1965
Opresko 4,554,479 Nov. 19, 1985
The examiner applied the following additional references
in new grounds of rejection set forth in the examiner’s answer:
Buescher et al. (Buescher) 3,974,414 Aug. 10, 1976
Falce et al. (Falce) 5,218,263 June 08, 1993
(filed Aug. 08, 1991)
Hale et al. (Hale) 5,422,536 June 06, 1995
(filed Aug. 03, 1993)
The admitted prior art.
2
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