Appeal No. 2005-2304
Application No. 10/127,555
display tube manufactured by the method. Claim 1 is
illustrative:
1. A method of producing a color display tube (1) with a
display window (3) and a color selection electrode (12)
comprising a shadow mask (13) and a frame (14), which method
comprises the process steps of forming the shadow mask (13) from
an apertured sheet, blackening said shadow mask (13) in a furnace
at a temperature of about at least 600°C and coupling the shadow
mask (13) to the frame (14) so as to form the color selection
electrode (12) which is suspended from the display window (3),
characterized in that, after the process step of blackening, the
shadow mask (13) is cooled down at a cooling rate substantially
higher than 50°C/min in order to obtain a significant decrease in
thermal expansion coefficient of the shadow mask (13).
THE REFERENCE
Ryoji1 10-130722 May 19, 1998
(Japanese patent application)
THE REJECTION
Claims 1-9 stand rejected under 35 U.S.C. § 103 as being
unpatentable over Ryoji.
OPINION
We affirm the aforementioned rejection.
The appellants state that the claims stand or fall in two
groups: 1) claims 1 and 4-9, and 2) claims 2 and 3. We therefore
limit our discussion to one claim in each group, i.e., claims 1
1 Citations herein to Ryoji are to the English translation
thereof which is of record.
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