Patents by Inventor Eberhard Koester

Eberhard Koester 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: 4939012
    Abstract: Naphtholactam dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, n, p, Z.sup.1, Z.sup.2 and the rings A, B, C and D each have the meanings stated in the description, and an optical recording medium which contains one or more naphtholactam dyes and may contain a base.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: July 3, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Matthias Dust, Peter Neumann, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski, Klaus-Dieter Schomann, Harald Kupplemaier, Eberhard Koester
  • Patent number: 4876356
    Abstract: Naphtholactam dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, n, p, Z.sup.1, Z.sup.2 and the rings A, B, C and D each have the meanings stated in the description, and an optical recording medium which contains one or more naphtholactam dyes and may contain a base.
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: October 24, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Matthias Dust, Peter Neumann, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski, Klaus-Dieter Schomann, Harald Kuppelmaier, Eberhard Koester
  • Patent number: 4668586
    Abstract: In magnetic recording media consisting of a non-magnetic base and, bonded on top of this, one or more magnetizable layers based on magnetic material finely dispersed in a polymer binder, a lubricant and further conventional additives, the lubricant used is a triethanolamine esterified with oleic acid.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: May 26, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Albert Kohl, Milena Melzer, August Lehner, Norbert Schneider, Eberhard Koester, Werner Balz, Friedrich Sommermann, Ernst Ricker
  • Patent number: 4656548
    Abstract: A tape cassette comprising at least one print-through echo-erasing device in the form of at least one appropriately shaped magnetic member made of permanent magnet material which is conveniently arranged on a tape guide element or near the apertures in the front wall of the cassette housing for the admission of scanning means. Such echo-erasing device can be used with advantage in any kind of magnetic tape cassette or cassette containing a recording medium having at least one magnetic track.
    Type: Grant
    Filed: November 22, 1983
    Date of Patent: April 7, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Dietmar Pfefferkorn, Gerhard Nerschbach, Eberhard Koester, Norbert Kreimes, Bozidar Pavelka
  • Patent number: 4567108
    Abstract: Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) a high molecular weight thermoplastic linear polyurethane, (2) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer and (3) an OH-containing polyurethane which is crosslinked with polyisocyanates.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: January 28, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Helmut Kopke, Hermann Roller, Werner Balz, Werner Grau, Eberhard Koester, Friedrich Sommermann
  • Patent number: 4497723
    Abstract: A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280.degree. to 620.degree. C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150.degree. to 450.degree. C., to acicular ferrimagnetic iron oxide of the formula FeO.sub.x, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.
    Type: Grant
    Filed: June 27, 1983
    Date of Patent: February 5, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Ohlinger, Guenter Vaeth, Peter Rudolf, Wilhelm Sarnecki, Helmut Jakusch, Eberhard Koester, Milena Melzer
  • Patent number: 4472455
    Abstract: Magnetic recording media are produced by dispersing finely divided anisotropic magnetic material and conventional additives in a solution of a polymeric binder in an organic solvent, or in an aqueous dispersion of a polymeric binder, adding a polymer based on hydrophilic ethylenically unsaturated compounds to the magnetic dispersion, applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic material in a magentic field and drying the applied layer.
    Type: Grant
    Filed: December 23, 1983
    Date of Patent: September 18, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Albert Kohl, Werner Balz, Milena Melzer, Norbert Schneider, Eberhard Koester, August Lehner
  • Patent number: 4453683
    Abstract: A cassette system for any type of recording medium in strip or tape form, such as films and magnetic tapes, consists essentially of a housing whose external dimensions match those of a conventional type of cassette, and a protective holder for the recording medium which is wound into at least one roll. The housing and the holder are separate or separable members and can be fitted together. Both are provided with means for inserting the holder into the housing in the correct position, and for introducing the recording medium into the transport apparatus. The housing is provided with opening and closing means. The holder can be designed to be separable from the roll of recording medium. Preferably, the housing is a precision-made article and the holder a low-cost article.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: June 12, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Juergen Reimer, Dietmar Pfefferkorn, Eberhard Koester, Norbert Kreimes, Wilhelmus Andriessen, Herbert Wagner, Werner Wagner
  • Patent number: 4438462
    Abstract: A process for authenticating recording media which are to be safeguarded against falsification and which possess a layer of exchange-anisotropic magnetic material, by determining the residual recording which is left over, because of the exchange anisotropy of the magnetic material, from a recording of a sequence of signals after exposure of the material to a specific temperature cycle and, subsequently, to a magnetic AC field which decreases to zero, and an apparatus for carrying out the said process.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: March 20, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Eberhard Koester, Joachim Hack, Manfred Steuerwald
  • Patent number: 4430362
    Abstract: Magnetic recording media are produced by a method wherein a fluid dispersion of finely divided magnetically anisotropic material in a film-forming binder mixture containing a polyurethane (obtained from a polyester which possesses free hydroxyl groups, and a di- or polyisocyanate) is applied to a non-magnetic base and the magnetic layer is then hardened.
    Type: Grant
    Filed: December 16, 1982
    Date of Patent: February 7, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Milena Melzer, Norbert Schneider, Helmut Kopke, Klaus Schoettle, Eberhard Koester, Werner Balz, Werner Grau
  • Patent number: 4423454
    Abstract: A magnetic recording disk comprising a non-magnetic substrate and two or more firmly adhering magnetizable layers applied to one or both sides thereof, the layer located directly on the substrate being magnetically isotropic, while the second layer and any additional layers exhibit orientation of the anisotropic magnetic particles parallel to the substrate and to the envisaged recording direction.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: December 27, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Felleisen, Dieter Mayer, Eberhard Koester, Friedrich Domas, Paul Deigner
  • Patent number: 4420330
    Abstract: A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25.degree. to 45.degree. C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50.degree. to 70.degree. C.
    Type: Grant
    Filed: April 16, 1982
    Date of Patent: December 13, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Jakusch, Werner Loeser, Eberhard Koester, Peter Rudolf, Werner Senkpiel, Werner Steck
  • Patent number: 4414287
    Abstract: A magnetic recording medium comprising a non-magnetic base which is dimensionally stable at up to 300.degree. C., and an 0.03-0.4 .mu.m thick magnetically hard recording layer of an Sm-Co alloy, vacuum-deposited thereon, which layer possesses uniaxial magnetic anisotropy in the plane of the layer, and a process for the manufacture of this recording medium.
    Type: Grant
    Filed: June 29, 1982
    Date of Patent: November 8, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckhart Kneller, Roland Koenig, Eberhard Koester, Werner Grau, Dieter Mayer
  • Patent number: 4396886
    Abstract: A process for authenticating recording media which are to be safeguarded against falsification and which possess discrete regions of an exchange-anisotropic magnetic material, by comparison of the polarity of a residual magnetization which is left over, because of the exchange anisotropy of the magnetic material, from a predetermined initial magnetization after exposure of the material to a specific temperature cycle and, subsequently, to a magnetic AC field which decreases to zero, with the polarity of a residual magnetization formed in the same way from an opposite initial magnetization, and an apparatus for carrying out the said process.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: August 2, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Eberhard Koester, Joachim Hack, Manfred Steuerwald
  • Patent number: 4382244
    Abstract: A device for magnetically orienting the magnetizable particles of magnetic recording media in a preferred direction, which media are obtained by applying a coating of anisotropically magnetic particles finely dispersed in a solution of an organic binder system and conventional additives to a non-magnetic base, and subsequently solidifying the coating, by the action, on the still fluid coating, of the magnetic fields produced by two E-shaped electromagnets arranged symmetrically with respect to, and in mirror-image relationship to, the plane of the said coating.
    Type: Grant
    Filed: March 11, 1981
    Date of Patent: May 3, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Eberhard Koester, Paul Deigner, Dieter Schaefer, Karl Uhl, Roland Falk
  • Patent number: 4287225
    Abstract: A magnetic recording medium comprising a non-magnetic base which is dimensionally stable at up to 300.degree. C., and an 0.03-0.4 .mu.m thick magnetically hard recording layer of an Sm-Co alloy, vacuum-deposited thereon, which layer possesses uniaxial magnetic anisotropy in the plane of the layer, and a process for the manufacture of this recording medium.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: September 1, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckhart Kneller, Roland Koenig, Eberhard Koester, Werner Grau, Dieter Mayer
  • Patent number: 4287233
    Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-200.degree. C.
    Type: Grant
    Filed: January 29, 1980
    Date of Patent: September 1, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Rudolf, Werner Steck, Eberhard Koester, Manfred Ohlinger, Christof Jaeckh
  • Patent number: 4221776
    Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by reducing heat-treated acicular iron(III) oxide hydroxide with an organic compound which decomposes in the presence of iron oxide at from 450.degree. to 650.degree. C., followed by at least partial oxidation with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the iron(III) oxide hydroxide employed is heat-treated at from 450.degree. to 700.degree. C. and has a surface area, measured by the BET method, of from 10 to 23 m.sup.2 /g.
    Type: Grant
    Filed: January 25, 1979
    Date of Patent: September 9, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Autzen, Helmut Jakusch, Eberhard Koester, Werner Loeser, Peter Rudolf, Wilhelm Sarnecki, Werner Steck
  • Patent number: 4213959
    Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by dehydrating acicular iron(III) oxide hydroxides to give acicular iron(III) oxides, then reducing these iron(III) oxides at from 300.degree. to 650.degree. C. by means of an organic compound which decomposes in this temperature range, and oxidizing the reduced product with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the acicular iron(III) oxide hydroxides employed consist of a mixture of goethite and lepidocrocite, containing at least 60% of the latter, and the dehydration is carried out at from 250.degree. to 700.degree. C.
    Type: Grant
    Filed: August 3, 1978
    Date of Patent: July 22, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Rudolf Brodt, Helmut Jakusch, Eberhard Koester, Werner Loeser, Manfred Ohlinger, Wilhelm Sarnecki, Werner Steck
  • Patent number: 4213222
    Abstract: An apparatus for continuously cleaning the surface of a web of plastics film provided with a magnetic coating, especially the surface of a magnetic tape, the surface to be cleaned being continuously kept in close contact with a tape of nonwoven fabric by virtue of the configuration of the path of travel of the web, wherein the poles of a magnet, which define an air gap, are located in the region of the contact area, behind the tape of nonwoven fabric, on the side facing away from the web.
    Type: Grant
    Filed: December 28, 1978
    Date of Patent: July 22, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Schoettle, Peter Dobler, Helmut Lewin, Eberhard Koester