General Electric Company

George Eric Coxon

Charles D Greskovich

Curtis E Scott

James Anthony Brewer

Mark E Duffy

A process for making an arc tube comprises the steps of sintering an arc tube composition to form the arc tube; annealing the arc tube in a vacuum; and sealing the arc tube with at least one electrode. Preferably, the arc tube annealed according to the present process is a ceramic arc tube. The annealing of the arc tubes in a vacuum preferably occurs at a temperature of between about 1000&deg; C. and 1500&deg; C.

Ceramic arc tube by annealing

A high pressure discharge lamp utilizing an improved ceramic arctube. The arctube has a ceramic central portion, a first ceramic leg extending from one end of the central portion and in some embodiments a second ceramic leg extending from the other end of the central portion. The arctube has reinforcing means where one or both of the legs joins the central portion to reinforce and strengthen the connection between each leg and the central portion. The reinforcing means is preferably seal glass or a layer of seal glass adjacent a ceramic ring.

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Leicestershire, United Kingdom

George Eric Coxon