Patents by Inventor Axel Schönfeld

Axel Schönfeld 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).

  • Laser marking of effect coatings
    Patent number: 6207240
    Abstract: The invention relates to a process for generating a marking on an effect coating or molding compound comprising cholesteric liquid-crystalline main-chain or side-group polymers or comprising a combination of main-chain and side-group polymers, which comprises inducing a color change at the irradiated sites of the effect coating or molding compound by laser irradiation.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: March 27, 2001
    Assignee: Clariant GmbH
    Inventors: Axel Schoenfeld, Andreas Stohr, Hans Joachim Metz
  • Molding composition based on fluoropolymers and process for producing foam material therefrom
    Patent number: 6184293
    Abstract: The invention relates to a molding composition based on fluoropolymers which additionally contain from 1 to 50% by weight of at least one polymer containing sulfoxide groups. The polymer containing sulfoxide groups comprises, in particular, polyarylene sulfoxide units of the formula: —(—C6H4—SO—)—.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: February 6, 2001
    Assignee: Hoechst AG
    Inventors: Axel Schönfeld, Andreas Schleicher, Georg Frank, Helmut Scheckenbach
  • Infrared-reflecting colorants
    Patent number: 6180025
    Abstract: Colorant composition consisting essentially of one or more cholesteric liquid-crystalline polymers having a pitch of the helical superstructure of between 760 nm and 500 &mgr;m, and of at least one colorant which absorbs light in the visible wavelength range. Suitable colorants are organic or inorganic pigments or dyes. Coatings featuring such colorant compositions are notable for heat insulation properties.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: January 30, 2001
    Assignee: Clariant GmbH
    Inventors: Axel Schoenfeld, Andreas Stohr
  • Cholesteric liquid-crystal polymers with increased weather stability
    Patent number: 6153722
    Abstract: The invention relates to a cholesteric liquid-crystalline polymer which in the molecule comprises at least one stabilizer comonomer from the group consisting of UV absorbers and antioxidants.
    Type: Grant
    Filed: April 7, 1999
    Date of Patent: November 28, 2000
    Assignee: Clariant GmbH
    Inventors: Axel Schoenfeld, Andreas Stohr
  • Polymer laminates having increased hiding power
    Patent number: 6143379
    Abstract: A polymer laminate essentially consisting of at least two cholesteric, liquid-crystalline polymer layers and a light-absorbent layer in between is suitable as starting material for effect pigments having a color impression which is dependent on the viewing angle.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: November 7, 2000
    Assignee: Clariant GmbH
    Inventors: Axel Schoenfeld, Bernd Dewald