Patents by Inventor Ludwig Graeff

Ludwig Graeff 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).

  • In-line ultrasonic check for detecting the partial vulcanization of a rubber mixture in the in situ silanization of bright fillers
    Publication number: 20220186001
    Abstract: The invention relates to a method for checking the silanization of pale-colored fillers, where a mixture comprising at least one silanized pale-colored filler, preferably silanized silica, and comprising at least one rubber is irradiated with ultrasound waves in a frequency range of 4 to 10 MHz, preferably of 5 to 7 MHz, and the signal strength of the ultrasound waves is determined after transmission through the rubber mixture, where the relative attenuation coefficient ?rel of the rubber mixture in the frequency range of the ultrasound waves is determined, the standard deviation ? of the relative attenuation coefficient ?rel is determined, and ?rel and ? are used for detection of incipient crosslinking of the rubber mixture.
    Type: Application
    Filed: February 17, 2020
    Publication date: June 16, 2022
    Applicant: LANXESS Deutschland GmbH
    Inventors: Andreas Schroeder, Ludwig Graeff, Lars Wawrzinski, Juergen Schilling
  • Method for testing the in situ silanization of bright fillers
    Patent number: 10988602
    Abstract: The invention relates to a method of testing silanization, which permits inline control of the in situ silanization of light-colored fillers, especially precipitated silicas. This enables continuous in situ silanization in the production of rubber mixtures comprising silanized light-colored fillers, and representative control of the rubber mixture under production conditions. The process is additionally nondestructive and has a high tolerance for carbon black as an additional constituent of the rubber mixture.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: April 27, 2021
    Assignee: LANXESS Deutschland GmbH
    Inventors: Andreas Schroeder, Lars Wawrzinski, Ludwig Graeff, Juergen Schilling
  • METHOD FOR TESTING THE IN SITU SILANIZATION OF BRIGHT FILLERS
    Publication number: 20190031866
    Abstract: The invention relates to a method of testing silanization, which permits inline control of the in situ silanization of light-colored fillers, especially precipitated silicas. This enables continuous in situ silanization in the production of rubber mixtures comprising silanized light-colored fillers, and representative control of the rubber mixture under production conditions. The process is additionally nondestructive and has a high tolerance for carbon black as an additional constituent of the rubber mixture.
    Type: Application
    Filed: January 19, 2017
    Publication date: January 31, 2019
    Applicant: LANXESS Deutschland GmbH
    Inventors: Andreas SCHROEDER, Lars WAWRZINSKI, Ludwig GRAEFF, Juergen SCHILLING
  • Method for determining the quality of non-crosslinked rubber mixtures, and corresponding device
    Patent number: 9796124
    Abstract: The invention relates to novel processes for determining the quality of an uncrosslinked rubber mixture by means of ultrasound and to an apparatus suitable for this purpose.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: October 24, 2017
    Assignee: LANXESS Deutschland GmbH
    Inventors: Andreas Schroeder, Lars Wawrzinski, Ludwig Graeff
  • METHOD FOR DETERMINING THE QUALITY OF NON-CROSSLINKED RUBBER MIXTURES, AND CORRESPONDING DEVICE
    Publication number: 20140366633
    Abstract: The invention relates to novel processes for determining the quality of an uncrosslinked rubber mixture by means of ultrasound and to an apparatus suitable for this purpose.
    Type: Application
    Filed: July 27, 2012
    Publication date: December 18, 2014
    Applicant: RHEIN CHEMIE RHEINAU GMBH
    Inventors: Andreas Schroeder, Lars Wawrzinski, Ludwig Graeff