US PATENT SUBCLASS 123 / 59.3
.~.~.~ Sleeve valve

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}
59.1  DF  .~.~ Rotary valve {3}
59.3.~.~.~ Sleeve valve

DEFINITION

Classification: 123/59.3

Sleeve valve:

(under subclass 59.1) Multiple cylinder engine wherein the rotary valve consists of a hollow, thin walled surface of revolution lining or in surrounding relationship to at least a portion of a working cylinder.