Patents by Inventor David L. Dauplaise

David L. Dauplaise 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 N-allyl-O-alkyl thionocarbamates
    Patent number: 4479903
    Abstract: A process for the preparation of N-allyl-O-alkyl thionocarbamates is disclosed which comprises reacting in an aqueous solvent and in the presence of a phase transfer catalyst a thiocyanate salt, and an allyl halide to form an allyl isothiocyanate and then reacting said allyl isothiocyanate in the presence of certain catalysts with an alcohol.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: October 30, 1984
    Assignee: American Cyanamid Company
    Inventor: David L. Dauplaise
  • Process for the flotation of sulfide minerals employing alkylaryl hydrocarbon compounds
    Patent number: 4341626
    Abstract: Alkylaryl hydrocarbons having at least eleven carbon atoms, when used either alone or in combination with known sulfide collectors, result in enhanced recovery and selectivity when used as collectors for sulfide minerals. These alkylaryl hydrocarbons are generally derived from the alkylation of aromatic compounds with the appropriate olefin in synthetic processes. Isopropyl naphthalene appears foremost among these compound as an effective sulfide collector.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: July 27, 1982
    Assignee: American Cyanamid Company
    Inventors: David L. Dauplaise, D. R. Nagaraj