Appeal No. 96-0640
Application 08/127,178
1. A mass-loaded coating for reducing the resonant
frequency of a rigid element comprising:
an adhesive matrix; and
a predetermined mass of a dense granular weighting
material which is mixed with said adhesive matrix
in a ratio of approximately 3:1 by mass.
8. A method of reducing the resonant frequency of a
rigid element comprising the steps of:
applying a layer of an uncured adhesive matrix over
an outer surface of said rigid element, said
adhesive
matrix including a predetermined mass of a dense
granular weighting material which is mixed with said
adhesive matrix in a ratio of approximately 3:1 by
mass; and
curing said adhesive matrix to a hardened state
wherein
said coating mass-loads said rigid element and
reduces
the resonant frequency thereof.
Discussion
The examiner has the initial burden to establish a prima
facie case of obviousness under 35 U.S.C. § 103. In re Fine,
837 F.2d 1071, 1074, 5 USPQ2d 1596, 1598 (Fed. Cir. 1998); In
re Piasecki, 745 F.2d 1468, 1472, 223 USPQ 785, 788 (Fed. Cir.
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