Appeal No. 1996-1699
Application No. 08/077,681
uneven removal of the cobalt layer.
Reed, on the other hand, is concerned with finding a less
troublesome method for producing a roughened, non-reflective
surface finish on metal trim pieces used, for example, on
automobiles and appliances. As described by Reed, the prior
art method includes a first plating step followed by a
blasting step
to roughen the plated surface using a 140 mesh particle size
abrasive media followed by a second plating step (Figure 1 and
col. 1, lines 43-63). Reed is particularly concerned with
controlling blasting depth in order to avoid eroding a first
plating layer. However, Reed’s solution is to blast prior to
applying the first plating layer using a coarser abrasive
media than typically used, i.e., 80-100 mesh, and to blast at
higher pressure and at closer range.
Oliver discloses a method of making bonded grid-cathode
units for microwave triode tubes using erosion lithography
(col. 1, lines 13-16). A specific object of Oliver is to
provide a grid-cathode structure having a grid pattern with
openings of the order of 0.001 inch or less (col. 1, line 66
to col. 2, line 2).
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