US PATENT SUBCLASS 313 / 318.03
.~.~ Having an annular contact disposed concentrically about the longitudinal axis of the envelope

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.~.~ Having an annular contact disposed concentrically about the longitudinal axis of the envelope {1}
318.04  DF  .~.~.~> Having screw thread coupling contact

DEFINITION

Classification: 313/318.03

Having an annular contact disposed concentrically about the longitudinal axis of the envelope:

(under subclass 318.01) Devices wherein the base has at least two contacts, at least one of which is annular and concentric about a longitudinal axis of the envelope or about an axis of engagement to a corresponding socket.