Patents by Inventor Dirk Holfter

Dirk Holfter 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: 6929823
    Abstract: A process for the high-speed rotary application of a liquid coating agent containing at least one pigment and/or at least one extender onto a substrate, wherein the process comprises the steps: (a) directly supplying at least two liquid components in a specified quantity ratio which determines the qualitative and quantitative composition of the coating agent to at least one high-speed rotary atomizer or preparation of a premix from at least two liquid components in a specified quantity ratio which determines the qualitative and quantitative composition of the coating agent and supply of the premix to at least one high-speed rotary atomizer, (b) high-speed rotary atomizing the components directly supplied in step (a) or of the premix supplied in step (a) to the at least one high-speed rotary atomizer and (c) applying the material atomized in step (b) onto a substrate, wherein at least one of the components used in step (a) contains at least one pigment and/or at least one extender.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: August 16, 2005
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Dirk Holfter
  • Publication number: 20040219300
    Abstract: A process for the high-speed rotary application of a liquid coating agent containing at least one pigment and/or at least one extender onto a substrate, wherein the process comprises the steps:
    Type: Application
    Filed: May 1, 2003
    Publication date: November 4, 2004
    Inventor: Dirk Holfter
  • Patent number: 6733842
    Abstract: A process for the high-speed rotary application of a liquid coating agent onto a substrate, wherein the process comprises the steps: (a) direct supply of at least two liquid components in a specified quantity ratio which determines the qualitative and quantitative composition of the coating agent to at least one high-speed rotary atomizer or preparation of a premix from at least two liquid components in a specified quantity ratio which determines the qualitative and quantitative composition of the coating agent and supply of the premix to at least one high-speed rotary atomizer, (b) high-speed rotary atomization of the components directly supplied in step (a) or of the premix supplied in step (a) to the at least one high-speed rotary atomizer and (c) application of the material atomized in step (b) onto a substrate, wherein at least one of the components used in step (a) differs from at least one further component used in step (a) with regard to density by 0.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: May 11, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Michael Becker, Dirk Holfter, Karl-Friedrich Doessel
  • Patent number: 6660325
    Abstract: A process for the application of aqueous multi-component coating compositions comprising at least two components and are prepared by premixing said components. The mixture is applied to a substrate using high-speed rotary atomization, wherein the high-speed rotary atomizer(s) is operated with a circumferential velocity of the spray edge(s) in the range of 10,000 to 25,000 m/min.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: December 9, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Dirk Holfter, Birgit Laack
  • Publication number: 20030124264
    Abstract: A process for the application of aqueous multi-component coating compositions comprising at least two components and are prepared by premixing said components, and optionally water. The mixture is applied to a substrate using high-speed rotary atomization, wherein the high-speed rotary atomizer(s) is operated with a circumferential velocity of the spray edge(s) in the range of 10,000 to 25,000 m/min.
    Type: Application
    Filed: December 27, 2001
    Publication date: July 3, 2003
    Inventors: Dirk Holfter, Birgit Laack
  • Patent number: 5453301
    Abstract: Continuous process for recovering the overspray of aqueous coating agents during spray application by collecting it in an aqueous washing liquid which is continuously circulated in a circuit (A) to the spray booth, where the solids concentration of said washing liquid is maintained within the range of 1-1.5 wt.-%, whereby a part of the washing liquid containing overspray is fed to a first ultrafiltration circuit (B) in which the solids concentration of the circulating liquid is maintained within a range of 8-15 wt.-%, a part of the circulating liquid from ultrafiltration circuit (B) being fed to a further ultrafiltration circuit (C) in which the solids concentration of the circulating liquid is maintained approximately constant within a range between 35 wt.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: September 26, 1995
    Assignee: Herberts Gesellschaft mit Beschrankter Haftung
    Inventors: Dietrich Saatweber, Waltraud Krumm, Bernhard Richter, Dirk Holfter