Patents by Inventor Bernd Schriewer

Bernd Schriewer 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).

  • Continuous process for the production and/or workup of polysaccharide derivatives
    Patent number: 7868166
    Abstract: A process is described for the continuous preparation and/or workup of polysaccharide derivatives by reaction and/or conditioning in a suspension with liquid reaction partners, in which, in accordance with FIG. 1, a) a preferably pumpable suspension stream of solids SE and liquid phase LE, if appropriate preheated to 185° C.
    Type: Grant
    Filed: May 2, 2003
    Date of Patent: January 11, 2011
    Inventors: Volker Eckhardt, Martin Lohrie, Bernd Schriewer, Holger Tanneberger
  • Process for shaping cellulose ethers
    Publication number: 20060205935
    Abstract: The present invention relates to a process for the manufacture of cellulose ethers. The process involves: (a) providing a perforated disk having a plurality of perforations; and (b) forcing feed cellulose ether through at least some of the perforations of the perforated disk, thereby forming compressed cellulose ether. The compressed cellulose ether formed in accordance with the method of the present invention has a higher bulk density and a more uniform particle size distribution than known cellulose ethers prepared by other processes.
    Type: Application
    Filed: January 30, 2006
    Publication date: September 14, 2006
    Inventors: Alexandra Hild, Marc Schmidt, Axel Altmann, Benedikt Langer, Wilhelm Oppermann, Bernd Schriewer, Heiko Thielking
  • Continuous process for the production and/or workup of polysaccharide derivatives
    Publication number: 20030220492
    Abstract: A process is described for the continuous preparation and/or workup of polysaccharide derivatives by reaction and/or conditioning in a suspension with liquid reaction partners, in which, in accordance with FIG.
    Type: Application
    Filed: May 2, 2003
    Publication date: November 27, 2003
    Inventors: Volker Eckhardt, Martin Lohrie, Bernd Schriewer, Holger Tanneberger
  • Essentially fiber-free cellulose ether with improved water retention, method for the production and use thereof
    Patent number: 6593468
    Abstract: This invention relates to a process for producing a substantially fiber-free carboxymethyl cellulose which predominantly exhibits elastic properties, to the use thereof as a superabsorbent material, and to the use thereof as an adjuvant substance for achieving suitable rheological and water retention properties for the cosmetics, pharmaceutical and food sectors, and for industrial applications, e.g. as an additive for coating materials, for the sealing of cables and for use in tunnelling and in civil and underground engineering.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: July 15, 2003
    Assignee: Wolff-Walsrode AG
    Inventors: Werner Lange, Bernd Schriewer, Friedrich-Karl Lampert, Wilhelm Oppermann, Jörn-Bernd Pannek, René Kiesewetter
  • Use of cellulose derivatives in drilling fluids
    Patent number: 4972007
    Abstract: Cellulose derivatives which are substituted in a specified manner by both carboxyalkyl groups and sulphoalkyl groups which are suitable in drilling fluids.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: November 20, 1990
    Assignee: Wolff Walsrode AG
    Inventors: Dieter Herzog, Bernd Schriewer