Abstract: A ZrO.sub.2 -containing glass ceramic is described, the main crystalline phase of which is formed by ZrO.sub.2 and which has at least one further crystalline phase, and which can be used in particular in dentistry.

Abstract: A leucite-containing phosphosilicate glass-ceramic is described which, in addition to a leucite crystalline phase and at least one further crystalline phase, also contains one or more glass phases.

Abstract: Alkali-zinc-silicate glass ceramics and glasses are described which have a linear thermal expansion coefficient in the range from 8.0 to 18.7.times.10.sup.-6 K.sup.-1, an excellent chemical resistance and other advantageous optical properties and can be used in particular as dental material.

Abstract: An opalescent glass is described which is characterized by a continuous glass phase and a discontinuous glass phase dispersed therein, and which can be used as dental material or as a constituent of dental materials.

Abstract: A pipe switch for pneumatically conveying a material such as bulk material includes a housing provided with a first port, a second port extending coaxially with the first port and a third port having an axis extending at an angle of less than 90.degree. relative to the axis of the second port, with the housing accommodating a cock which extends between opposing side covers and by which the first port is selectively connectable with the second port and with the third port. In order to reduce a danger of accident and to allow easy access to the interior of the pipe switch, the entire drive unit for actuating the cock is connected to the pipe switch at one of the side covers, with all movable parts being housed within an external compartment defined by an outer wall mounted to the one side cover.

Abstract: An easy-open flexible bag filled with compressed flexible articles. The bag has a substantially rectangular form after filling with the compressed flexible articles. The rectangular form comprises a pair of opposed front panels interconnected to a pair of opposed side panels which are oriented substantially perpendicular to the direction of compression of the flexible articles. A bottom panel is connected to the lowermost edges of the front panels and the side panels and a top panel is connected to the uppermost edges of the front panels and the side panels. The interconnected front panels and side panels are subject to tension induced by the compressed flexible articles. The flexible bag further includes an easy-opening device provided on one of the tensioned side panels of the flexible bag for providing an opening in a predetermined portion of the tensioned side panel without releasing the tension in the remainder of the side panel.

Abstract: Process and Device for heat removal from the effective area of a cooling container with the application of dry-ice as cooling agent, where a refrigerant (e.g. FREON) is circulated in a closed pipe system.According to the construction and degree of charge the gravity cooling system (thermosyphon) or evaporation principle with natural circulation is used to take up the heat from interior space and to supply it to dry-ice as heat of sublimation.The systems of heat transfer are arranged in such a way that even for the inclined cooling container, e.g. at the time of aircraft take-off, at least half of the diagonally arranged heat transfer systems in the interior part are fully active to provide sufficient cooling.

Abstract: The present invention relates to a container for refrigerating goods with dry ice. The container comprises an enclosed interior space subdivided by partition walls into a plurality of compartments which include one refrigerant compartment adapted to be charged with dry ice refrigerant and at least one chillroom compartment adapted for the containment of the goods to be refrigerated. The refrigerant compartment communicates with the chillroom compartment by openings which allow evaporating carbon dioxide from the dry ice to enter the chillroom compartment. The container also includes storage means of water located between the refrigerant compartment and the chillroom compartment in a sufficient quantity that at the beginning of the evaporation of the dry ice, the temperature in the chillroom compartment does not become substantially below -78.degree. C.Also disclosed is a method for refrigerating goods utilizing dry ice and storage means of water in the above mentioned container.

Abstract: Apparatus is provided for automatically dispensing CO.sub.2 snow on articles moved by a conveyer underneath a snow storage container-dispenser outlet opening. The dispensing is controlled by a motor driven segmented drum with brush-like elastic blades closing the dispenser outlet opening actuated when an article is moved into place thereunder. The snow is generated from liquid CO.sub.2 flowing through cooling coils in the snow and dispensed through a nozzle in the upper portion of the container in response to capacity sensing means such as a photocell level detector to thereby keep the container snow level constant.

Abstract: Compositions comprising stable, water-insoluble coatings on substrates to which biologically active proteins can be covalently coupled so that the resultant product has the biological properties of the protein and the mechanical properties of the substrate, for example, magnetic properties of a metal support. The resultant product can be utilized in diagnostic immunoassays as an example, and when the metal substrate is magnetic, the product can be removed from liquid media by a magnetic field ensuring that any washing or incubation process can be finished promptly and efficiently.

Abstract: A guide member for use with a magnetic reading and/or recording head of a ticket issuing machine is made of material of low permeability and has a portion of material of high permeability. When the guide member is located adjacent a magnetic read/record head and is adjusted so that the material of high permeability is in register with the gap of the head, the separation loss between the head and a ticket, coated with a magnetisable material and passing between the head and the guide, is reduced to a minimum.