Patents by Inventor Eckhard Wenderoth

Eckhard Wenderoth 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).

  • Optically brightened plastics for optically brightening paper-coating compounds and paper-coating compounds optically brightened in this manner
    Patent number: 6387296
    Abstract: Paper coating slips having high whiteness, high greying limit and high lightfastness can be prepared with the aid of whitened finely divided plastics.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: May 14, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Eckstein, Joachim König, Fritz Puchner, Ulrich Feldhues, Matthias Köcher, Uwe Vogt, Eckhard Wenderoth
  • Preparation and use of iminodisuccinic acid salts
    Patent number: 6207010
    Abstract: A process for the preparation of iminodisuccinic acid alkali metal salts by reaction of maleic acid and ammonia in an aqueous medium in the presence of alkali metal hydroxides and working up thereof.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: March 27, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Torsten Groth, Winfried Joentgen, Paul Wagner, Frank Döbert, Eckhard Wenderoth, Thomas Roick
  • Preparation and use of iminodisuccinic acid salts
    Patent number: 6107518
    Abstract: A process for the preparation of iminodisuccinic acid alkali metal salts by reaction of maleic acid and ammonia in an aqueous medium in the presence of alkali metal hydroxides and working up thereof.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: August 22, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Torsten Groth, Winfried Joentgen, Paul Wagner, Frank Dobert, Eckhard Wenderoth, Thomas Roick
  • Paper finishing aid
    Patent number: 6090871
    Abstract: This invention relates to compositions comprising a polyisocyanate having ionic groups or polyether groups and at least one member selected from the group consisting of a naturally occurring polymer, a polysiloxane graft copolymer, a water-dilutable synthetic polymer and a cationic polymer or a naturally occurring polymer and at least one member selected from the group consisting of a polysiloxane graft copolymer, a water-dilutable synthetic polymer and a cationic polymer.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: July 18, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Reiners, Jurgen Kopp, Joachim Konig, Harro Traubel, Eckhard Wenderoth, Bernhard Jansen, Joachim Probst
  • Coating slips with polyisocyanates
    Patent number: 6008289
    Abstract: The present invention relates to pigmented coating slip suitable for the production of coated papers and boards containing(a) a coating pigment,(b) 5 to 20%, based on the coating pigment, of at least one synthetic binder,(c) optionally, 0.01 to 20%, based on the coating pigment, of a naturally occurring binder,(d) optionally, 0.01 to 5%, based on the coating pigment, of a cobinder,(e) 0.01 to 5%, based on the coating pigment, of an optical brightener,(f) 0.01 to 5%, based on the coating pigment, of at least one water-dispersible polyisocyanate, and(g) optional additives.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: December 28, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Joachim Konig, Eckhard Wenderoth, Jurgen Kopp, Gottfried Wallpott