Patents by Inventor Helmut Hollfelder

Helmut Hollfelder 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).

  • Process for the chlorination of methylsilanes
    Patent number: 6720440
    Abstract: The invention relates to a process for the chlorination of methylsilanes, which comprises reacting methylsilanes with chlorine in the presence of at least 0.1% by weight of hydrogen chloride, based on the weight of methylsilane of the formula (II), under the action of electromagnetic radiation which induces chlorination, chlorine being used in a substoichiometric amount based on the methylsilane of the formula (II), and the reaction being carried out at temperatures below the boiling point of the methylsilane of the formula (II). The invention further relates to an apparatus suitable for carrying out the chlorination of an industrial scale.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: April 13, 2004
    Assignee: Wacker-Chemie GmbH
    Inventors: Helmut Hollfelder, Siegfried Pflaum, Franz Riener
  • Process for the chlorination of methylsilanes
    Publication number: 20030088117
    Abstract: The invention relates to a process for the chlorination of methylsilanes, which comprises reacting methylsilanes with chlorine in the presence of at least 0.1% by weight of hydrogen chloride, based on the weight of methylsilane of the formula (II), under the action of electromagnetic radiation which induces chlorination, chlorine being used in a substoichiometric amount based on the methylsilane of the formula (II), and the reaction being carried out at temperatures below the boiling point of the methylsilane of the formula (II). The invention further relates to an apparatus suitable for carrying out the chlorination of an industrial scale.
    Type: Application
    Filed: October 18, 2002
    Publication date: May 8, 2003
    Applicant: Wacker-Chemie GmbH
    Inventors: Helmut Hollfelder, Siegfried Pflaum, Franz Riener