Patents by Inventor Reiner Esselborn

Reiner Esselborn 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: 5472640
    Abstract: The application relates to conductive lamellar pigments in which lamellar substrate is coated with an electrically conductive layer, characterized in that a lamellar metal oxide or a lamellar material coated with one or more metal oxides is present as the lamellar substrate and that an optionally hydrated silicon dioxide layer or a layer of another insoluble silicate is arranged between the metal oxide layer and the conductive layer.
    Type: Grant
    Filed: April 22, 1994
    Date of Patent: December 5, 1995
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Hans D. Bruckner, Reiner Esselborn
  • Patent number: 4867794
    Abstract: In mica/titanium dioxide pigments reliable rutilization is obtained with small amounts of tin by precipitating tin dioxide directly on the mica and completing this precipitation before the precipitation of titanium dioxide is started.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: September 19, 1989
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Klaus Ambrosius, August Knapp, Helmut Plamper, Reiner Esselborn
  • Patent number: 4780140
    Abstract: The invention relates to platelet-shaped pigments of the formula Al.sub.x Fe.sub.2-x O.sub.3-y, wherein x has a value from 0.02 to 0.5 and y has a value from 0.3 to 1.0, which are optionally coated with further oxides.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: October 25, 1988
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Klaus D. Franz, Reiner Esselborn, Ralf Emmert, Hans D. Bruckner
  • Patent number: 4668570
    Abstract: Base lacquers suitable for use in multi-layer lacquerings containing a layer of base lacquer and a layer of clear lacquer on top of this, contain a nacreous pigment based on mica flakes coated with metal oxides, wherein the nacreous pigments have a particle size substantially in the range between 5 and 25 .mu.m. The resultant lacquerings have advantageous properties.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: May 26, 1987
    Assignees: Merck Patent Gesellschaft mit beschraenketer Haftung, Herberts GmbH
    Inventors: Reiner Esselborn, Klaus Ambrosius, Hans-Joachim Graetz, Manfred Letsch
  • Patent number: 4537636
    Abstract: A process for preparing nacreous pigments having improved gloss properties and based on mica platelets coated with metal oxides comprises suspending mica platelets in a solution containing titanium sulfate, the mica platelets having a coating comprising a homogeneous mixture of titanium dioxide, aluminum oxide and silicon dioxide, and further coating the suspended platelets by slow heating of the suspension.
    Type: Grant
    Filed: March 30, 1983
    Date of Patent: August 27, 1985
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Horst Bernhard, Reiner Esselborn
  • Patent number: 4494993
    Abstract: Nacreous pigments having improved transparency and tinctorial strength and based on mica flakes coated with metal oxides, have a metal oxide layer which is formed as a homogeneous mixed layer in which, in addition to titanium dioxide, there also is present silicon dioxide and aluminum oxide. These can be produced by coating mica in an aqueous suspension with a titanium dioxide hydrate layer and then washing, drying and calcining. Silicon dioxide and aluminum hydroxide are precipitated as a uniform layer together with the titanium dioxide hydrate. The new pigments can be used for pigmenting plastics, lacquers, paints and cosmetics, inter alia.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: January 22, 1985
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Horst Bernhard, Reiner Esselborn
  • Patent number: 4482389
    Abstract: Nacreous pigments which have improved stability to weathering and are based on mica flakes coated with metal oxides, are provided with a stabilizing, chromium-containing second coating which comprises a combination of metal salts. To form the second layer, iron and/or manganese are deposited on the starting pigments in the form of the hydroxide, carbonate or phosphate and chromium is deposited on the starting pigments in the form of the hydroxide, carbonate or phosphate or as methacrylato-chromium chloride. These are prepared by adding iron and/or manganese and chromium, in the form of salt solutions and at a pH of 2 to 8, to an aqueous suspension of a mica flake pigment coated with metal oxides, precipitating them on the mica flake pigments, and separating off these pigments and drying them.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: November 13, 1984
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Klaus-Dieter Franz, Klaus Ambrosius, Reiner Esselborn, Manfred Kieser
  • Patent number: 4128435
    Abstract: Pigmented substantially crack-free casein plastic compositions containing a minor, luster-imparting quantity of coated mica platelets, wherein at least 75% of the pigment particles possess an average platelet size of below 10 .mu.m., a thickness of about 0.1 to 0.7 .mu.m. and a ratio of diameter to thickness of about 10 to 200.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: December 5, 1978
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Wilhelm Baumer, Horst Bernhard, Reiner Esselborn, Jorg Ohngemach, Otto Stahlecker, Fritz Zureda
  • Patent number: 4086100
    Abstract: Mica flake-based lustrous pigments having a plurality of TiO.sub.2 and SnO.sub.2 layers thereon comprising at least one succession of rutile/SnO.sub.2 /rutile have improved properties, including light and weathering fastness.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: April 25, 1978
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reiner Esselborn, Horst Bernhard
  • Patent number: 4076551
    Abstract: A process for the preparation of carbon black-containing pigments consists essentially of precipitation of a carbon black-containing metal hydroxide or bismuth oxychloride layer on substrate particles in an aqueous suspension containing carbon black particles of particle size of below 1 mn. and washing, drying and optionally calcining the products. Flaky substrates, e.g., mica flakes coated with TiO.sub.2, are preferably employed. Carbon black-containing pigments obtained have carbon black particles incorporated in a metal hydroxide, metal oxide or bismuth oxychloride layer precipitated on the substrate in the presence of the carbon black.
    Type: Grant
    Filed: December 10, 1976
    Date of Patent: February 28, 1978
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Horst Bernhard, Reiner Esselborn
  • Patent number: 4040859
    Abstract: Lustrous pigments based on mica flakes coated with metal oxides have a very uniform coating layer of tin dioxide, which can contain aluminum oxide, or the hydrates thereof.
    Type: Grant
    Filed: May 18, 1976
    Date of Patent: August 9, 1977
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Reiner Esselborn, Horst Bernhard
  • Patent number: 3951679
    Abstract: Blue colored mica flake pigments are provided by coating mica flakes, or mica flakes optionally coated with a uniform metallic oxide layer, with a uniform layer of a low-solubility iron compound convertible into Berlin blue [ferric hexacyanoferrate(II)], and then converting this layer into Berlin blue.
    Type: Grant
    Filed: March 15, 1974
    Date of Patent: April 20, 1976
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Horst Bernhard, Alfred Stein, Reiner Esselborn, Reiner Hesse, Horst Russmann