U.S. Philips Corporation

Tjepke Hendrik Ekkelboom

Antonius Johannes Van Stratum

Karel M Van Der Waarde

Adrianus J Vermeulen

Johannes Jacobus Geytenbeek

Thomas Geeven

Jan Rudolf De Bie

Willem Lodewijk Van Hoorn

Otmar Schob

The electric lamp has a quartz glass lamp vessel having tungsten current supply conductors extending through the wall of the lamp vessel to an electric element arranged in the lamp vessel. The current supply conductors have a continuous coating of quartz glass where they extend through the envelope wall from the interior to the exterior of the lamp vessel. The coating forms with the current supply conductor a glass/metal interface forming a gas-tight seal. The glass of the coating adjoining the interface contains thorium, hafnium, chromium, aluminum, titanium, tantalum, magnesium, calcium, strontium, barium, zirconium, lanthanum, scandium, lanthanides, niobium, boron and yttrium. The coating has a very strong adhesion to the metal and; the lamp vessel at the gas-tight seal has a great strength.

Electric lamp with SiO.sub.2 vessel and seal therefor

The electric lamp has a quartz glass lamp vessel (1) with molybdenum current supply conductors (3) extending to an electric element (2) arranged in the lamp vesel (1). The current supply conductors (3) have a continuous coating (4) of quartz glass which is fused to the lamp vessel (1). The coating (4) forms with the current supply conductor (3) a glass/metal interface (5). The glass of the coating (4) adjoining the interface (5) contains thorium, hafnium, chromium, aluminum, titanium, tantalum, magnesium, calcium, strontium, barium, zirconium, lanthanum, scandium, a lanthanide, niobium, boron or yttrium. The coating (4) has a very strong adhesion to the metal; the lamp vessel (1) has a great strength.

Electric lamp and seal structure therefor

A method of manufacturing a drawing die, in which a core of, for example, natural or synthetic diamond is clamped in the cavity intended for this purpose by deforming a tube which is made of, for example, a copper alloy to an annulus, the core being properly centered through the use of a rod-like member by means of which the core is pressed against the bottom of the cavity by a rod-like member having a pressure surface parallel to the bottom of the cavity during the deformation of the cylinder; in this way tilting of the core is precluded and it is not covered with material of the annulus in places where this is undesirable.

Method of manufacturing a drawing die

A high-pressure discharge lamp having at least one electrode fabricated by an isostatic compression process.

High-pressure discharge lamp

A method of making glass beads for current leading-in wires of lamps by internal and external high-frequency heating of a glass tube which surrounds a metal rod.

Method of manufacturing an article containing at least one glass part in

A soldered joint between articles of at least one of the high melting point metals, high melting point carbides and high melting point metal oxides, which joint contains zirconium in which at least the external surface layer of the soldered joint consists of zirconium nitride. The soldered joint is preferably used for securing electrodes for high-pressure gas discharge lamps to current supply conductors. The soldered joint can be obtained by soldering with zirconium in a rare gas atmosphere whereafter the soldering area is heated for some time in a nitrogen-containing atmosphere.

Solder joint connection between lead-in conductor and electrode

Electrodes for a discharge lamp having a semispherical fused body to produce a very stable arc. The electrodes can be manufactured inter alia by compressing a mixture of tungsten powder, metal carbide powder and a binder to a moulding, sintering the moulding, and fusing it then at least partly in a discharge arc, the sintered moulding serving as one of the electrodes.

Growing community of inventors

Eindhoven, Netherlands

Tjepke Hendrik Ekkelboom