Patents by Inventor Robert John James Simkins

Robert John James Simkins 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).

  • Preparation of nitrophenols
    Patent number: 3933926
    Abstract: A process for the preparation of nitrophenols by adding over a period of time a suspension containing from about 4 to about 20 per cent weight/volume of nitrosated phenol to a nitric acid solution containing between 45 and 100 per cent by weight of nitric acid, said solution being maintained at a temperature in the range from about 45.degree. to 100.degree.C.
    Type: Grant
    Filed: May 30, 1973
    Date of Patent: January 20, 1976
    Inventors: David Anthony Salter, Robert John James Simkins