US PATENT SUBCLASS 313 / 611
.~.~ Constriction means

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

567  DF  WITH GAS OR VAPOR {24}
609  DF  .~ Having baffle, partition, or constricting means affecting discharge {2}
611.~.~ Constriction means {1}
612  DF  .~.~.~> Substantially the full length of discharge path

DEFINITION

Classification: 313/611

Constriction means:

Subject matter under subclasses 609+ wherein the structure includes, (1) envelope structure which changes the cross-sectional area of the envelope, or (2) physical means within the envelope to reduce the cross-sectional area of the discharge of the discharge device.

(1) Note. A constriction reduces the area of the electrical discharge at least in one position of the discharge path within the tube and does not change the length of the discharge path.