Panel lamp with terminal bases

Claim 1

A FLUORESCENT PANEL LAMP COMPRISING A GENERALLY FLAT RECTANGULAR VITREOUS ENVELOPE FORMED OF A BACKPLATE AND A FACEPLATE SEALED TOGETHER ALONG THEIR MARGINS, SAID BACKPLATE HAVING A PLURALITY OF PARALLEL INTERCONNECTED GROOVED CHANNELWAYS FORMED THEREIN TO DEFINE A LABYRINTHINE DISCHARGE CHANNEL, SAID SEALED MARGINS PROVIDING A VITREOUS LEDGE EXTENDING AROUND SAID ENVELOPE, ELECTRODES SUPPORTED IN THE ENDS OF SAID DISCHARGE CHANNEL, AND A PAIR OF BASE TERMINAL STRUCTURES SEATED ON AND ATTACHED TO SAID MARGINAL LEDGE NEAR OPPOSITE ENDS THEREOF ON ONE SIDE OF SAID ENVELOPE, EACH BASE STRUCTURE BEING IN THE FORM OF AN ELONGATED BLOCK OF INSULATING MATERIAL HAVING A GENERALLY FLAT FRONT FACE WITH AN APERTURE THERETHROUGH, GENERALLY STRAIGHT SIDE WALLS EXTENDING FORWARDLY INTO PROJECTING WINGS ON EACH SIDE OF THE FRONT FACE, A TOP WALL EXTENDING BACK FROM THE FRONT FACE AND CURVING SMOOTHLY DOWN TO THE REAR TO FORM THE REAR END WALL WITH A CURVATURE APPROXIMATELY MATCHING THAT OF THE THE OUTERMOST GROOVED CHANNELWAYS IN SAID BACKPLATE, AND A PAIR OF SPACED CONTACT PINS PROJECTING FORWARDLY OF SAID FRONT FACE BETWEEN SAID WINGS.