Patents by Inventor Walter Holtrup

Walter Holtrup 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).

  • Method for reducing the formation of foam during the treatment of a dispersion or a liquid with water vapour
    Patent number: 6364939
    Abstract: A process for reducing the foam formation when a dispersion or liquid is treated with steam by a) introduction of steam into the lower region of a column and simultaneous feed of a medium at the top of the column, the steam ascending to the top of the column, b) contacting the medium with the steam, with foam formation, includes the medium fed in stage a) having been generated by mixing a dispersion or liquid with steam in an apparatus, this medium during the feed into the top of the column having a higher temperature than that of the steam which comes into contact with the medium (in stage b)).
    Type: Grant
    Filed: May 8, 2000
    Date of Patent: April 2, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Hübinger, Walter Holtrup, Wolfgang Heider
  • Process and apparatus for cooling a continuously inflowing liquid in vacuo
    Patent number: 6076362
    Abstract: A process for cooling a continuously inflowing liquid, in particular a dispersion, in vacuo which comprises subjecting the liquid to a flash evaporation in a separator.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: June 20, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Hubinger, Walter Holtrup, Jochen Kessler
  • Filling and emptying of storage tanks containing aqueous dispersions
    Patent number: 5971036
    Abstract: A method of filling and emptying storage tanks containing aqueous dispersions, where the storage tank is emptied via a line whose opening is located in the lower section of the storage tank entails filling the storage tank with a line whose outlet follows the changes in the level of the liquid surface in the course of filling and removal procedures, the level of the outlet being adjusted such that the opening is located approximately at the height of the level of the liquid.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: October 26, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerd Rehmer, Walter Holtrup
  • Compounding of polymer dispersions
    Patent number: 5856381
    Abstract: A process for compounding polymer dispersions, which comprises circulating the polymer dispersion from a vessel (7) having a stirring device (6) through a line (3) having a mixing device (2) by means of a pump (4) which is located in the line (3), and, before the entry of the circulated polymer dispersion into the mixing device (2), metering at least one solution or dispersion of at least one compounding material from at least one stock container (5) via a supply line (9) into the circulated polymer dispersion.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: January 5, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerd Rehmer, Walter Holtrup, Karlheinz Schwarz
  • Elimination of volatile residues from polyacrylate melts
    Patent number: 5772851
    Abstract: Volatile components are eliminated from polyacrylate melts by distilling off the volatile components by a process in which the volatile components are distilled off under reduced pressure, entraining agents are added to the melts at above 100.degree. C. and the melts are simultaneously circulated.
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: June 30, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Jurgen Barwich, Oral Aydin, Ulrich Erhardt, Walter Holtrup