US PATENT SUBCLASS 123 / 311
FOUR-CYCLE

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

311FOUR-CYCLE {19}
312  DF  .~> Engine cylinder having a reciprocating sleeve valve {2}
315  DF  .~> Multiple exhaust
316  DF  .~> Having subcharger associated with the cylinder
317  DF  .~> Crankcase compression of air or combustible mixture to be subsequently pumped into the working cylinder
318  DF  .~> Rear compression of air or combustible mixture to be subsequently pumped into the working cylinder
76  DF  .~> Scavenging
77  DF  .~> Single revolution
78 R  DF  .~> Variable clearance {6}
79 R  DF  .~> Single poppet valve {2}
80 R  DF  .~> Rotating valve {5}
81 R  DF  .~> Oscillating valve {3}
82  DF  .~> Rotating side shaft
83  DF  .~> Rotating transverse shaft
84  DF  .~> Adjacent supply and exhaust valves
85  DF  .~> Aligned supply and exhaust valves
86  DF  .~> Opposite supply and exhaust valves
87  DF  .~> Longitudinal valve and lever
88  DF  .~> Transverse valve and lever
89  DF  .~> Transverse valve and bell crank

DEFINITION

Classification: 123/311

FOUR-CYCLE:

(under the class definition) Subject matter having a single-acting working cylinder and a single working piston reciprocating therein and in which compression takes place in the working cylinder before ignition, said engine working upon a cycle comprising four distinct strokes, namely, an expansion stroke following ignition of the charge, followed by exhaust, intake, and compression strokes.

(1) Note. This subclass and those indented hereunder are intended to include four-stroke cycle engines in which at least one of the cycles is varied or modified from the conventional four-stroke cycle engine. A nominally claimed four-stroke cycle is not sufficient for classification in this and indented subclasses, if there is significant disclosure for classification elsewhere in the class, unless there is a claim for a specific four-stroke engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

559+, for a super-charged four-cycle engine.