Egyt Gyogyszervegyeszeti Gyar

Tungsram Reszvenytarsasag

Tungsram Rt

Tungsram Reszvenytarsasag Abr. Tungsram Rt.

Janos Nagy

Endre Oldal

Istvan Horvath

Laszlo Nagy

Attila Szemzo

Laszlo Tvos

Janos Sagi

Gyula Busai

Anna Szabolcs Nee Borbas

Maria Peredy Nee Kajtar

Csilla Rethati

Istvan Koczka

Pal Ivan

Ildiko Fritzsche Nee Lukacs

An improved welding auxiliary material for producing welded joints between refractory metal parts of high-wattage electric light sources is described. The characteristic feature of the invention is that the welding auxiliary material has a porous structure surface layer sintered from a refractory metal powder having a melting point of above 2000.degree. C.

Welding auxiliary material

Electrolytically rhenium coated molybdenum current inlet conductor

The invention relates to (E)-5-(2-bromovinyl)-uridine and its derivatives of general formula VI, ##STR1## wherein R.sup.1 stands for a hydrogen atom, C.sub.1-8 alkanoyl group, benzoyl group or a benzoyl group substituted in para position either with a C.sub.1-4 alkyl group or a halogen atom, and a process for preparing them by brominating 2',3',5'-tri-O-acyl-5-ethyl-uridine of general formula IV, ##STR2## wherein R is identical with R.sup.1, except where R.sup.1 stands for a hydrogen atom, dehydrohalogenating the resulting dibromo compound of general formula V ##STR3## and optionally deacylating it. The resulting compounds of general formula VI are exhibiting significant potency against Herpes simplex virus species and are of remarkably low acute toxicity.

Process for the preparation of 5-(2-bromovinyl)-uridine

Electrical current supply terminal, especially for discharge tubes of light sources having a high pressure gas discharge. The invention is concerned with an electrical feed through, especially for discharge tubes of light sources having high pressure gas discharge, which current supply terminal is passed through a ceramic material, preferably from aluminum oxide and with a binding material is hermetically binded thereto, the heat expansion coefficient of which is appropriately selected and which is preferably vitreous enamel. In order to eliminate the difficulties resulting from the different heat expansion coefficient of ceramics, binding material and the metal material, the feed through is formed from a bundle of metallic threads. The bundle comprises preferably strands or braids and as material preferably molybdenum or tungsten is used.

Electrical current inlet particularly for discharge tubes of high

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Budapest, Hungary

Janos Nagy