Patents by Inventor Helmut Jakusch

Helmut Jakusch has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6936340
    Abstract: Multilayer magnetic recording medium which is suitable for high recording densities and the recording of digital data, has very good electromagnetic recording properties and good surface smoothness and can absorb a large amount of lubricant in the lower layer and has at least one upper magnetic recording layer less than 0.5 ?m thick and at least one lower layer which contains a magnetically soft pigment.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: August 30, 2005
    Assignee: Imation Corp.
    Inventors: Helmut Jakusch, Albert Kohl, Peter Heilmann, Ronald John Veitch, Ria Kress, Stefan Müller, Johannes Sandrock, Hartmut Heene
  • Patent number: 6835450
    Abstract: Multilayer magnetic recording medium is suitable for high recording densities and the recording of digital data, has very good electromagnetic recording properties in the entire recording wavelength range and good mechanical properties and possesses a flat frequency response and which has at least one upper magnetic recording layer less than 0.5 &mgr;m thick and at least one lower layer which contains a magnetically soft pigment.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: December 28, 2004
    Assignee: Imation Corp.
    Inventors: Ronald John Veitch, Albert Kohl, Helmut Jakusch, Andreas Ilmer, Peter Heilmann, Ria Kress, Stefan Müller, Johannes Sandrock
  • Publication number: 20020012815
    Abstract: Multilayer magnetic recording medium is suitable for high recording densities and the recording of digital data, has very good electromagnetic recording properties in the entire recording wavelength range and good mechanical properties and possesses a flat frequency response and which has at east one upper magnetic recording layer less than 0.5 &mgr;m thick and at least one lower layer which contains a magnetically soft pigment.
    Type: Application
    Filed: April 6, 2001
    Publication date: January 31, 2002
    Applicant: EMTEC MAGNETICS GmbH
    Inventors: Ronald John Veitch, Albert Kohl, Helmut Jakusch, Andreas Ilmer, Peter Heilmann, Ria Kress, Stefan Muller, Johannes Sandrock
  • Publication number: 20020009617
    Abstract: Multilayer magnetic recording medium which is suitable for high recording densities and the recording of digital data, has very good electromagnetic recording properties and good surface smoothness and can absorb a large amount of lubricant in the lower layer and has at least one upper magnetic recording layer less than 0.5 &mgr;m thick and at least one lower layer which contains a magnetically soft pigment.
    Type: Application
    Filed: April 6, 2001
    Publication date: January 24, 2002
    Applicant: EMTEC MAGNETICS GmbH
    Inventors: Helmut Jakusch, Albert Kohl, Peter Heilmann, Ronald John Veitch, Ria Kress, Stefan Muller, Johannes Sandrock, Hartmut Heene
  • Publication number: 20010026880
    Abstract: Tape-like magnetic recording media having a nonmagnetic substrate and at least one layer applied to the substrate having incorporated into at least one of these layers, an inorganic needle-shaped pigment which serves as a supporting pigment and has a ratio of the average length to the average diameter of the pigment of at least 3, and the mean modulus of elasticity of the layers is not less than 15 Gpa in the longitudinal direction of the tape-like recording media.
    Type: Application
    Filed: March 19, 2001
    Publication date: October 4, 2001
    Inventors: August Lehner, Helmut Jakusch, Volker Koch, Manfred Ohlinger, Albert Kohl, Werner Lenz, Norbert Schneider, Peter Heilmann, Werner Hubner, Erich Hoffmann, Ronald John Veitch, Rudi Lehnert, Harald Jachow
  • Patent number: 6235368
    Abstract: A magnetic recording medium which consists of at least two layers cast one on top of the other is described, the lower layer containing acicular magnetic pigments having a field strength of 5-40 kA/m and a magnetization of 20-70 nTm3/g and the upper layer containing a high-density metal powder dispersion. After application of the layers, the magnetic recording medium is subjected to a magnetic disorientation treatment while the layers are in the wet state, so that said recording medium has virtually no magnetic and mechanical anisotropy. The magnetic recording medium produced in this manner is particularly suitable for floppy disks having a high storage capacity of substantially more than 100 megabytes.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: May 22, 2001
    Assignee: EMTEC Magnetics GmbH
    Inventors: Hans-Bertram Wiegemann, Peter Stehle, Hansjörg Traub, Helmut Jakusch
  • Patent number: 6231963
    Abstract: 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).
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: May 15, 2001
    Assignee: EMTEC Magnetics GmbH
    Inventors: August Lehner, Helmut Jakusch, Volker Koch, Manfred Ohlinger, Albert Kohl, Werner Lenz, Norbert Schneider, Peter Heilmann, Werner Hübner, Erich Hoffmann, Ronald John Veitch, Rudi Lehnert, Harald Jachow
  • Patent number: 6040041
    Abstract: A magnetic recording medium consisting of a nonmagnetic substrate and at least two magnetizable layers which are applied thereon and contain metal oxides as magnetic pigment is described, the pigment of the upper layer having a higher BET value than that in the lower layer. According to the invention, the upper layer has a thickness in the range of 3-5 .mu.m when dry and the lower layer a thickness in the range of 1.1-3 .mu.m when dry. Particularly advantageous results are obtained when the magnetic pigment of the upper layer is cobalt-doped .gamma.--Fe.sub.2 O.sub.3 and that of the lower layer is acicular CrO.sub.2. With the double-layer recording medium obtained according to the invention, in particular the output level at low frequencies is improved without the frequency curve showing the usual depression in the middle.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: March 21, 2000
    Assignee: EMTEC Magnetics GmbH
    Inventors: Klaus Gotz, Helmut Jakusch, Werner Loch, Erich Hoffmann, Hans-Georg Gottmann, Hans-Joachim Jenor, Johann Voit
  • Patent number: 5569409
    Abstract: A finely divided acicular CrO.sub.2 modified with iron, tellurium and/or antimony and having a high coercive force possesses improved heat stability of the residual induction and a relatively narrow distribution of the particle size and of the coercive force. This CrO.sub.2 pigment is obtained by a method in which the iron compound used for the modification is iron oxalate, which is employed in an amount of 1-10% by weight, based on the theoretical CrO.sub.2 yield.
    Type: Grant
    Filed: November 16, 1994
    Date of Patent: October 29, 1996
    Assignee: BASF Magnetics GmbH
    Inventors: Harald Jachow, Reinhard K orner, Ronald J. Veitch, Ekkehard Schwab, Helmut Jakusch, Bernd H oppner, Rudi Lehnert, Manfred Ohlinger
  • Patent number: 5490476
    Abstract: An apparatus for checking deep-frozen food, which irreversibly indicates if an additional storage temperature has been exceeded, is described. A flat plastic bag having transparent walls, into which eutectic mixture having a liquid/solid phase transition in the range from 0.degree. to -50.degree. C. has been introduced, together with a magnetic dispersion consisting of finely divided magnetic pigments, has a heat-conducting connection to the material to be frozen. A magnetic stripe which contains a magnetically recorded pattern and which remains connected to the bag until the indicating apparatus together with the material to be frozen has been cooled below the limiting temperature is stuck to the bag. The magnetic stripe is then removed. If the permissible limiting temperature is exceeded, the optically or magnetically readable structure produced by the magnetic stripe in the indicator bag is eliminated, permitting easy checking of the deep-frozen food.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: February 13, 1996
    Assignee: BASF Magnetics GmbH
    Inventors: Ronald J. Veitch, Helmut Jakusch, Peter Heilmann
  • Patent number: 5378383
    Abstract: A magnetic recording medium comprising a nonmagnetic substrate and at least one magnetic layer applied thereon and containing an acicular chromium dioxide uniformly distributed in a polymeric binder and additives and having a coercive force of at least 60 kA/m, a mean particle length of the chromium dioxide of less than 300 nm, whose factor HD according to the formula ##EQU1## where KT is the coercive force of the magnetic layer in [kA/m], measured in an external field of 380 kA/m, L is the mean particle length and .DELTA.L is the range of the particle size distribution, determined from the numerical distribution of the particle length, both measured in [nm], is greater than 1.85, and a process for the preparation of this chromium dioxide.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: January 3, 1995
    Assignee: BASF Magnetics GmbH
    Inventors: Harald Jachow, Ekkehard Schwab, Reinhard Koerner, Norbert Mueller, Rudi Lehnert, Manfred Ohlinger, Helmut Auweter, Helmut Jakusch, Ronald J. Veitch, Michael Bobrich
  • Patent number: 5153022
    Abstract: 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.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: October 6, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Ronald J. Veitch, Gerhard Soehring, Helmut Jakusch, Volker Koch
  • Patent number: 5050015
    Abstract: A method and an arrangement for reducing wear in magnetic storage means having magnetic disks, in particular having flexible media, become effective when predetermined maximum waiting times of the heads on the same track or the same tracks have elapsed. The heads HD are moved away from the waiting tracks in accordance with the predetermined control scheme, may be moved in waiting areas of the magnetic surface, and are moved back to the waiting position.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: September 17, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Joachim Hack, Werner Grau, Werner Sickmueller, Heinrich Mannsperger, Helmut Jakusch
  • Patent number: 5047161
    Abstract: Isometric cobalt- and titanium-containing magnetic iron oxides are prepared by reacting acicular iron(III) oxide hydroxides with compounds of divalent cobalt and iron and compounds of tetravalent titanium in aqueous alkaline suspension at elevated temperature.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: September 10, 1991
    Inventors: Werner Steck, Hartmut Hibst, Helmut Jakusch
  • Patent number: 5009877
    Abstract: Acicular ferromagnetic chromium dioxide is stabilized by treatment with an alkali metal hydroxide in an aqueous alkaline suspension at elevated temperatures.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: April 23, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Steck, Laszlo Marosi, Herbert Haberkorn, Rainer Feser, Werner Huebner, Helmut Jakusch
  • Patent number: 5006406
    Abstract: In magnetic recording media which have at least one magnetizable layer firmly applied to a nonmagnetic base, the magnetizable layer essentially consists of a magnetic material finely dispersed in an organic polymer binder, a dispersant, a lubricant and other conventional additives.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: April 9, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Jenoe Kovacs, Milena Melzer, Werner Balz, Werner Lenz, Werner Loch, Helmut Jakusch
  • Patent number: 4933004
    Abstract: Ferromagnetic metal particles of substantially iron are prepared by starting from an acicular .alpha.-FeOOH, applying a shape-stabilizing finish to the particle surface, heating at 500.degree.-850.degree. C. and subsequently reducing with gaseous reducing agents at 200.degree.-500.degree. C. to the metal, and starting .alpha.-FeOOH being prepared in the presence of zinc and phosphate ions.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: June 12, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus-Dieter Hoppe, Werner Steck, Jenoe Kovacs, Rainer Feser, Helmut Jakusch
  • Patent number: 4826671
    Abstract: Finely divided, acicular and pore-free .alpha.-Fe.sub.2 O.sub.3 is prepared from iron(III) salts in the presence of one or more organic substances which form complexes with iron(III) ions, in alkaline suspension, at from 80.degree. to 250.degree. C.
    Type: Grant
    Filed: March 11, 1987
    Date of Patent: May 2, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Volker Arndt, Rainer Feser, Werner Steck, Helmut Jakusch
  • Patent number: 4781851
    Abstract: Ferromagnetic chromium dioxide is improved by subjecting chromium dioxide materials prepared by a known method to an additional heat treatment.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: November 1, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Steck, Herbert Haberkorn, Laszlo Marosi, Werner Huebner, Helmut Jakusch
  • Patent number: 4774072
    Abstract: Acicular .alpha.-Fe.sub.2 O.sub.3 is prepared from iron(III) salts by heating an alkaline aqueous suspension of iron(III) hydroxide in the presence of one or more organic substances which form complexes with iron(III) ions to a temperature of 100.degree. C. or less.
    Type: Grant
    Filed: March 11, 1987
    Date of Patent: September 27, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Volker Arndt, Bernd Meyer, Rainer Feser, Werner Steck, Helmut Jakusch