Patent ID: 8241082

Claim:
A method of making an electrodeless incandescent bulb, the method comprising the steps of: providing a bulb enclosure of quartz glass; forming an adjacent neck having a bore less than a transverse internal dimension of the bulb enclosure either: integrally with the bulb enclosure or in a branch tube opening into the bulb enclosure; forming a further neck remote from the adjacent neck, either in a tube extending integrally from the adjacent neck integral with the bulb enclosure or in the branch tube; preparing the bulb for sealing by performing the following steps in direct sequence: inserting at least one pellet of excitable material all the way into the bulb enclosure through the adjacent neck, evacuating the bulb enclosure through the adjacent neck and filling the bulb tube with inert gas, after evacuation and prior to sealing; preliminarily sealing the bulb at the further neck; and finally sealing the bulb at the adjacent neck.