Patents by Inventor Richard E. Sheads

Richard E. Sheads 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).

  • One solvent process for preparation of esters of 3,5-dibromo-4-hydroxybenzonitrile
    Patent number: 4439368
    Abstract: Esters of 3,5-dibromo-4-hydroxybenzonitrile can be prepared in high yields from 4-cyanophenol in a single solvent. In this manner, the 3,5-dibromo-4-hydroxybenzonitrile intermediate need not be isolated, and therefore the bromination and esterification reactions can be performed in one reactor. Preferably, the bromination is accomplished with bromine chloride in the presence of 1,1,2-trichloroethane followed by esterification with an acid chloride in the same solvent.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: March 27, 1984
    Assignee: Union Carbide Corporation
    Inventor: Richard E. Sheads
  • Two solvent process for preparation of esters of 3,5-dibromo-4-hydroxybenzonitrile
    Patent number: 4436665
    Abstract: Esters of 3,5-dibromo-4-hydroxybenzonitrile can be prepared in high yields from 4-cyanophenol by reacting said phenol with preformed bromine chloride in 3% aqueous hydrogen bromide and then azeotropically distilling off the solvent/reaction medium with an aromatic hydrocarbon which then serves as the esterifying solvent medium for reaction with an acid halide. In this manner, both reactions can be accomplished without removing the product of the bromination reaction from the reaction vessel, i.e., a solids separation step is avoided.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: March 13, 1984
    Assignee: Union Carbide Corporation
    Inventors: Richard E. Sheads, David A. Segal