Patents by Inventor Jurgen Lahrs

Jurgen Lahrs 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 of organic isocyanates
    Patent number: 4419295
    Abstract: Organic mono- or poly-isocyanates are produced on a continuous basis by phosgenating the corresponding amines. A solution of the amine to be phosgenated is continuously sprayed through a smooth-jet nozzle into a solution of phosgene continuously flowing through a mixing chamber. The mixing chamber is maintained at a temperature of 120.degree.to 300.degree. C. and a pressure of from 10 to 1000 bars. The molar ratio of phosgene to primary amino groups is generally from 2:1 to 30:1.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: December 6, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Joachim Hennig, Jurgen Lahrs, Dietrich Liebsch
  • Process for the manufacture of preparations with a low dust content
    Patent number: 4344766
    Abstract: Pulverulent preparations with a low dust content, in particular dyestuff powders, are obtained when the customary dustproofing agents are not added before the drying process and also are not sprayed directly onto the product to be dustproofed, but are allowed to act on the pulverulent product in the form of an aerosol.The average particle size of the aerosol is less than 10.mu..
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: August 17, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Lahrs, Klaus Schubert, Claus Gosling, Dorde Jovcic, Harald Gleinig, Reiner Skerhut
  • Modular block for osmotic methods of separation
    Patent number: 4334992
    Abstract: A modular block for osmotic methods of separation under pressure can be folded open and the filtration unit can easily be removed and introduced in the process. The filtration unit consists of a base plate with a membrane filter candle, and the filter candle consists of a stack of membrane filter plates. Spacers are placed between the filter plates and deflecting plates are provided to ensure zigzag penetration. The permeate transportation is displaced to the edge of the plates. The permeate issues laterally at the flange.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: June 15, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wulf von Bonin, Jurgen Lahrs, Eberhard Born
  • Process for the preparation of chloroformic acid methyl ester
    Patent number: 4261918
    Abstract: In a process for the continuous preparation of chloroformic acid methyl ester by contacting phosgene with methanol at a temperature of up to 50.degree. C. in a reactor which contains chloroformic acid methyl ester as the solvent and in which phosgene is dispersed, the improvement wherein gaseous phosgene is dispersed by already formed and circulated chloroformic acid methyl ester into the reaction chamber by means of a dispersing device, and at the same time methanol is introduced into the homogeneous gas-in-liquid dispersion.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: April 14, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Werner Schulte-Huermann, Erhard Schellmann, Jurgen Lahrs