Basf Aktiengesellschaft

Basf Magnetics Gmbh

Emtec Magnetics Gmbh

Volker Koch

Hans-Josef Sterzel

Helmut Jakusch

Norbert Schneider

Peter Heilmann

Ronald J Veitch

Ralf Noerenberg

Roland Koenig

Herbert Henkler

Hermann Deichelmann

August Lehner

Werner Lenz

Manfred Ohlinger

Albert Kohl

Peter Schuhmacher

Frank Meyer

Frank Prechtl

Klaus Manzke

Robert Parker

Harald Jachow

Volker Richter

Peter Felleisen

Peter Hammerschmitt

Hubert Fehrenbach

Rudi Lehnert

Ernst-Juergen Grittmann

Bernd Roeger

Erich Hoffmann

Gerhard Soehring

Werner H&uuml;bner

Bernhard Boese

The rod-shaped apatite crystals of the formula Ca(PO)(OH)Fhave the following features The invention furthermore describes dispersions which contain such rod-shaped apatite crystals, and a process for the preparation of the dispersions or of the apatite crystals.

Rod-shaped apatite crystals having a specific length-to-width ratio

Rod shaped apatite crystals having a specific length-to-width ratio

The invention relates to cholesteric layered material having an improved color impression, to pigments prepared therefrom, and to a process for the production and use thereof.

Cholesteric layered material having an improved color impression, and the production thereof

Described are tape-type magnetic recording media (I) including a non-magnetic substrate (III), at least one film applied to the substrate and, in at least one of these films, an inorganic acicular pigment (II) suitable for use as a supporting pigment, the ratio of the mean length to the mean diameter of the pigment (II) being at least 3 and the mean modulus of elasticity of the films being not less than 15 GPa in the longitudinal direction of the tape-type recording medium (I).

Magnetic recording media

A cleaning cassette for magnetic heads in a cassette drive includes at least one container with cleaning fluid, comprising an at least partially flexible hollow body, at least one valve device and at least one feed channel for the cleaning fluid to the cleaning device. The cleaning system can be used for tape cassettes and disk cassettes with magnetic medium.

Cleaning cassette for magnetic heads

A process for the production of magnetic recording media having stochastic orientation of the magnetic anisotropic particles in the magnetic layer with the aid of a magnetic drum rotating above the still fluid dispersion layer and containing radially arranged permanent magnets of alternating polarity, and a corresponding apparatus for carrying out the process.

Stochastic orientation of magnetic recording media

Before being coated with the magnetizable material, the substrate plates are machined on a precision turning lathe in such a way that the annular surface provided for the storage area is convexly arched on both sides of the plate. For this purpose, the substrate plate, during machining, is held on the chuck in a concave arch of the annular surface and machined flat with a purely radial free movement of the cutting tool, or held on a flat chuck and turned down under a feed movement of the tool, which feed movement corresponds to the required convex arching of the annular surface. In the first machining method, the elastically deformed substrate plate, after removal from the chuck, loses tension and forms a convexly arched annular surface.

Method and apparatus for the surface machining of substrate plates for

A device for positioning objects which have a low mass, especially for positioning magnetic heads over preselected magnetic tracks on at least one magnetic disk, which can be coupled to a drive, in a memory processing unit, in which a carriage, which is capable of being moved toward and away from the axis of rotation of the magnetic disk, carries at least one magnetic head, this carriage being so mounted between guide elements that it can be displaced by a drive motor longitudinally with respect to the chassis of the unit, wherein the guide elements, in particular pairs of anti-friction bearings, engage either side of the carriage, at least one of the pairs of anti-friction bearings being gimbal-mounted in order to counteract any tilting moments which may act on the carriage. The device advantageously includes a band-type drive mechanism for displacing the carriage, comprising a rotatable cylindrical member around which the band means is wound and which may serve as an additional bearing element. The novel device can be used with advantage in any type of positioning system, especially in any type of system for storing video signals, data signals, audio signals or control signals and having high track densities.

Device for positioning objects which have a low mass

A magnetic domain storage device comprising a ferromagnetic, polycrystalline metal layer which is applied to a support and comprises areas of different coercivity, the areas of lower coercivity in the form of strip-shaped channels being surrounded by areas of higher coercivity; a system of electrical conductors, extending in planes arranged parallel and in close vicinity to the ferromagnetic layer for creating, propagating and detecting magnetic domains in the channels of lower coercivity; and a baseplate with electrical connections. The areas of lower coercivity follow a path similar to a spiral with its one end adjacent to the center of the support and the other end adjacent to a corner of the support and executing at least one full 360.degree. turn between both ends. The domain storage devices of this type are distinguished by a higher storage capacity.

Magnetic domain storage device

A magnetic thin film storage device of simplified design working on the shift register principle and comprising a flat support to which a ferromagnetic layer has been applied, which layer contains regions of different coercivity, lower-coercivity regions being surrounded by regions of higher coercivity, and also comprising electric conductors extending in planes which are parallel to the support, the conductors serving to produce the magnetic fields required to propagate magnetic domains into the lower-coercivity regions, at least one group of channels being provided which terminate in the same enlarged lower-coercivity area, and the magnetic domains contained in the channels terminating in the said enlarged area being propagated individually and consecutively into that enlarged area. The components of thin-film storage devices of this type can be easily brought into register with the aid of mechanical stops or similar devices and their production can thus be largely automated; besides, the risk of random errors occurring in the flow of data can be substantially reduced, owing to the particularly simple geometric shape of the channels.

Magnetic thin film storage device

Growing community of inventors

Battenberg, Germany

Volker Koch