Patents by Inventor Francisco A. Martins Mendes Cerejo

Francisco A. Martins Mendes Cerejo 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).

  • Dehydrogenation process
    Patent number: 4451686
    Abstract: Catalytic dehydrogenation of alkyl- or dialkyl- aromatic hydrocarbons such as ethylbenzene or ethyltoluene to vinyl aromatic hydrocarbons is achieved by passing the aromatic hydrocarbons on a crystalline silica which has been calcined under an inert atmosphere and which contains from about 0.05 to about 1 weight percent of an alkali metal oxide such as sodium oxide. In the preparation of the crystalline silica, limited washing of the crystalline silica precursor is performed to obtain an amount of alkali metal oxide remaining in the crystalline silica between about 0.05 and about 1 weight %.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: May 29, 1984
    Assignee: Cosden Technology, Inc.
    Inventors: Georges E. M. J. De Clippeleir, Raymond M. Cahen, Francisco A. Martins Mendes Cerejo