US PATENT SUBCLASS 123 / 58.6
.~.~ Step piston

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

52.1  DF  MULTIPLE CYLINDER {7}
58.1  DF  .~ Cylinders in-line {10}
58.6.~.~ Step piston

DEFINITION

Classification: 123/58.6

Step piston:

(under subclass 58.1) Multiple cylinder engine including at least one piston configured with at least two different cross sections along the piston's length, the configured piston is received in a cylinder with at least two different diameter bores.