Patents by Inventor Jean Riethmann

Jean Riethmann 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 producing cyameluric chloride
    Patent number: 4205167
    Abstract: A process for the production of cyameluric chloride is disclosed which comprises passing cyanuric chloride, mixtures of cyanuric chloride and cyanogen chloride, or cyanogen chloride, at temperatures of 200.degree. to 700.degree. C., together with oxygen over active charcoal, and separating the resulting cyameluric chloride by desublimation from the gas mixture obtained.Cyameluric chloride is a valuable intermediate.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: May 27, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: Claude Gremmelmaier, Jean Riethmann
  • Process for the production of substituted benzal and benzyl bromides
    Patent number: 4191621
    Abstract: The invention describes a process for the production of benzal or benzyl bromides which contain electrophilic substituents in the ortho- and/or para-position, or mixtures thereof, by the side-chain bromination of correspondingly substituted toluene, which comprises introducing elementary chlorine, under irradiation with visible light, into a two-phase system consisting of an aqueous phase and an organic phase and containing a correspondingly substituted toluene, at least one metal bromide, and a base, and also the compounds obtained by this process.
    Type: Grant
    Filed: September 26, 1978
    Date of Patent: March 4, 1980
    Assignee: Ciba-Geigy Aktiengesellschaft
    Inventors: Jean Riethmann, Franz Marti, Tibor Somlo