Patents by Inventor Ramanadin

Ramanadin 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 preparation of trifluoromethylbenzenes from the corresponding trichloro- or tribromo-methylbenzenes
    Patent number: 4462937
    Abstract: This invention relates to a continuous process for the preparation of trifluoromethylbenzenes from the corresponding trichloro- or tribromo-methylbenzenes with hydrofluoric acid. The process is characterized by passing an ascending stream of gaseous hydrofluoric acid, countercurrently through a plurality of mobile successive liquid layers of the trichloro- or tribromo-methylbenzenes.
    Type: Grant
    Filed: March 12, 1981
    Date of Patent: July 31, 1984
    Assignee: Rhone-Poulenc Industries
    Inventors: Ramanadin, Laurent Seigneurin
  • Preparation of anion exchange resins by bromination of vinyl aromatic polymers
    Patent number: 4327191
    Abstract: Process for preparing anion exchange resins comprising polymerizing a vinyl aromatic compound having at least one alkyl group containing about 1 to 3 carbon atoms, alone or mixed with a copolymerizable monomer, optionally in the presence of a mineral support, followed by brominating the alkyl groups of the resulting polymer by means of an N-bromoamide or an N-bromoimide, and then aminating the brominated product obtained. The resulting anion exchange resins are useful in the chemical, pharamaceutical, food, and metallurgical industries.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: April 27, 1982
    Assignee: Rhone-Poulenc Industries
    Inventors: Adrien Dromard, Ramanadin