Appeal No. 97-1037
Application 08/467,869
The PCT document discloses a method of making a web
for manufacturing gaskets, such as vibration and noise damping
spacers for vehicle brakes. As disclosed in this document,
whether with the prior art method of Figures 1 and 2, or with the
invention method of Figures 3 and 4, the resulting spacer would
be constituted as a body of sheet metal coated with a vulcanized
rubber layer on at least one side thereof. Thus, this document
teaches the type of spacer (external rubber layer) indicated by
appellant (specification, page 1) to pose the problem that the
present invention seeks to overcome.
Niwa as previously described teaches a constraint type
of vibration damper (Figures 2 and 23), effective as the noise-
preventing-material for disc brakes. As shown in Figure 2, this
form of damper can comprise metal sheets 1 and 4 with a rubber
layer 2 and resin film (hot melt adhesive) 3 therebetween
(Figure 2), or as depicted in Figure 23 this form of damper can
comprise a viscoelastic polymeric layer 2 bonded between two
steel sheets 1. As portrayed in Figure 22 of Niwa, a known non-
constraint type of vibration damper includes a thin steel sheet
with rubber bonded to both sides thereof (column 1, lines 15
through 20).
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