US PATENT SUBCLASS 267 / 81
.~ Composite springs of diverse material, e.g., metal and non-metal

Current as of: June, 1999
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267 /   HD   SPRING DEVICES

80  DF  SPRING PANEL {9}
81.~ Composite springs of diverse material, e.g., metal and non-metal {2}
82  DF  .~.~> Vented fluid chamber modifies action of metallic spring
83  DF  .~.~> Superposed layers; metal and non-metal {1}

DEFINITION

Classification: 267/81

(under subclass 80) Device which includes two or more springs differing in the kind of substance which they utilize to effect a spring action (as metal, rubber, air) and acting in concert to support the load.