Patents by Inventor Roger K. Rains

Roger K. Rains 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).

  • Method of preparing 4-aminodiphenylamine
    Patent number: 5608111
    Abstract: A method of producing 4-ADPA is disclosed wherein aniline or substituted aniline derivatives and nitrobenzene are reacted under suitable conditions to produce 4-nitrodiphenylamine or substituted derivatives thereof and/or 4-nitrosodiphenylamine or substituted derivatives thereof and/or their salts, either or both of which are subsequently reduced to produce 4-ADPA or substituted derivatives thereof. The 4-ADPA or substituted derivatives thereof can be reductively alkylated to produce p-phenylenediamine products or substituted derivatives thereof which are useful as antiozonants.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: March 4, 1997
    Assignee: Flexsys America L. P.
    Inventors: Michael K. Stern, James M. Allman, James K. Bashkin, Roger K. Rains
  • Process for preparing benzothiazole sulfenimides using an aliphatic hydrocarbon solvent
    Patent number: 5204481
    Abstract: An improved process for producing N-alkyl or N-cycloalkyl-2-benzothiazole sulfenimides uses aliphatic hydrocarbons as a reaction medium in converting N-alkyl or N-cycloalkyl-2-benzothiazole sulfenamides to the corresponding sulfenimides by reaction with an acid.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: April 20, 1993
    Assignee: Monsanto Company
    Inventors: Sharen B. Carroll, Horng-Jau Lin, Roger K. Rains