Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Helmuth Krauss

Frank Joseph

Matthias Kuntz

Gerd Bauer

Peter Muller

Werner Gunkel

Klaus Kreher

The invention relates to a process and a device for obtaining pure oxygen using a gastight membrane which can conduct both electrons and oxygen ions.

Process and device for obtaining pure oxygen

The invention relates to test strips for the detection of substances present in liquids and comprises a firm support and matrices impregnated with reagents. The matrices are spaced from one another on the support by means of adhesive strips, and the adhesive strips are covered with strips of film.

Test strips

A sliding valve for withdrawing liquid or gaseous chemical products from a container has a cylindrical valve spool which slides axially in a bore through a valve housing. A first annular groove of the valve spool connects, in the open position of the valve, a product supply line to a product withdrawal line. On one side of this first annular groove there is a second annular groove which, in the open position, connects a gas supply line to a gas withdrawal line. An annular groove on the other side is connected to the second annular groove. By this arrangement, protective gas is admitted to the valve spaces on either side of the first annular groove, which handles the product, with the result that escape of the product to the outside, or penetration of impurities, are positively prevented.

Valves for chemical containers

The present invention provides a transport container for very pure liquid chemicals having an inner container or flask made of synthetic resin with an upper sealing flange, the inner container being in an outer container, which has a protective collar, provided with openings, surrounding the sealing flange at a distance. The inner container 1 is made of two skins, the inner skin being made of an inert fluoro-synthetic resin and the outer sheet 10 being made of glass-fiber-reinforced synthetic resin completely enclosing the inner skin. The outer skin 10 is in one piece with a cylindrical mantle 11, the upper section of which forms the protective collar 14.

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Bensheim, Germany

Helmuth Krauss