Appeal No. 1997-3148
Application 08/408,088
This is a decision on appeal from the final rejec-
tion of claims 5 through 8 and 12 through 19, all of the
claims
pending in the present application. Claims 1 through 4 and
9 through 11 have been cancelled.
The Appellants' invention relates to a cathode ray
tube having at least one semiconductor cathode for generating
an electron beam. On page 1 of the specification, Appellants
disclose that problems occur in the manufacturing process of
the cathode ray tube when a conditioning step known as spot-
knocking is done. Spot-knocking is a process in which a
number of grids in the tube acquire a high to very high volt-
age while the substrate and the gate electrodes of the semi-
conductor cathode are grounded. During this spot-knocking
operation, flashovers are produced so that the grid closest to
the cathode acquires a high voltage instead of a comparatively
low voltage. This results in a destructive breakdown of the
insulating layer between the cathode electrode and the adja-
cent substrate.
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