Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2006-06-20
2006-06-20
San Martin, Edgardo (Department: 2837)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C138S113000, C138S114000, C138S126000
Reexamination Certificate
active
07063181
ABSTRACT:
A method of dampening fluid-borne noise in an automotive power steering system in accordance with a presently preferred embodiment of the invention contemplates provision of a power steering fluid hose having a laminated inner tube surrounded by a reinforcing outer tube. The inner tube has a resilient inner layer with a radial thickness T1and a resilient outer layer with a radial thickness T2. The inner layer is softer than the outer layer and is bonded by vulcanization to the outer layer. The radial thicknesses T1and T2have a ratio selected to dampen fluid-borne noise within a preselected frequency range by elastic expansion of the inner and outer layers.
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Dana Corporation
Martin Edgardo San
Reising Ethington Barnes Kisselle P.C.
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