US PATENT SUBCLASS 313 / 318.04
.~.~.~ Having screw thread coupling contact

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

317  DF  WITH ENVELOPE {2}
318.01  DF  .~ Having base and connector {8}
318.03  DF  .~.~ Having an annular contact disposed concentrically about the longitudinal axis of the envelope {1}
318.04.~.~.~ Having screw thread coupling contact

DEFINITION

Classification: 313/318.04

Having screw thread coupling contact:

(under subclass 318.03) Devices wherein the annular contact is concentrically disposed about a central contact and is in the form of a sleeve having grooves or threads which function to mechanically and electrically couple the base to a corresponding socket having a mating annular grooved or threaded contact and a central contact.