Patents by Inventor Frank Dennis Marsh

Frank Dennis Marsh 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).

  • N-cyanoaziridines
    Patent number: 4115384
    Abstract: N-Cyanoaziridines containing the grouping ##STR1## are obtained by reacting an ethylenically unsaturated compound with cyanogen azide (N.sub.3 CN). Exemplary is 3-cyanoazatricyclo[3.2.1.0.sup.2.4 ] octane of the formula ##STR2## obtained by reacting norbornene with N.sub.3 CN.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frank Dennis Marsh
  • Nitrobenzotrichloride or bromide process
    Patent number: 4098831
    Abstract: In the hypohalite halogenation in a two phase aqueous/organic solvent medium of a mono- or dichloro- or bromo-methylnitrobenzene to a corresponding trihalomethylnitrobenzene, the improvement wherein the reaction is conducted in the presence of a phase transfer catalyst or where the organic phase is a C.sub.4 to C.sub.8 alkanol.
    Type: Grant
    Filed: August 3, 1977
    Date of Patent: July 4, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frank Dennis Marsh
  • Para-nitrobenzotribromide process
    Patent number: 3993704
    Abstract: The conversion of p-nitrobenzal bromide to p-nitrobenzotribromide, an intermediate in the preparation of the insecticide, 1,5-bis(4-trifluoromethylphenyl)-3-cyanoformazan, by reacting p-nitrobenzal bromide with an alkali or alkaline earth metal hypobromite is improved by carrying out the reaction in a two-phase, water-organic solvent system.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: November 23, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Frank Dennis Marsh, Colin Leslie McIntosh