Patents by Inventor David E. Raposa

David E. Raposa 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).

  • Tetrahalophthalic anhydride process
    Patent number: 5288879
    Abstract: This invention relates to an improvement in a process for preparing tetrabromophthalic anhydride whereby there is a substantial recovery of reactants such as halogen and SO.sub.3 from a vent stream exiting the reaction vessel. The improvement comprises contacting the vent stream with a fluid having a first oleum concentration and recovering a halogen stream and a second stream, having a second oleum concentration wherein the second oleum concentration is greater than the first oleum concentration.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: February 22, 1994
    Assignee: Ethyl Corporation
    Inventors: Scott A. Bottelberghe, Bonnie G. McKinnie, Steven G. Miller, David E. Raposa