Appeal No. 96-2391
Application 08/002,286
sleeve. Consequently, Opresko wants to retain as much heat at
the closed end of the sleeve as possible. Opresko achieves this
by removing the thermal conductive nickel layer except at the
closed end of the sleeve. Any additional portions of the nickel
layer not removed would serve to draw heat away from the closed
end of the sleeve which would make the electron gun less
efficient.
Although Larson does teach a cathode sleeve where the
outer element essentially covers all of the inner element in a
telescoping fashion, the emissive material in Larson is arranged
on the sidewall in the axial direction so that it would defeat
the purpose of the Opresko sleeve. Since Larson generates
electrons radially from the sidewall, Larson wants to draw the
heat to the sidewall region as opposed to the end region. This
drawing of heat to the sidewall region would adversely affect
Opresko’s attempt to consolidate the heat at the closed end of
the sleeve.
Since Opresko and Larson are both concerned with
concentrating the heat at the location where the emissive
material is situated, their teachings would only be combined if
it was desired to have emissive material at both the closed end
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