Patents by Inventor Leona M. Baclawski

Leona M. Baclawski 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 producing N,N'-disubstituted paraphenylene diamine mixtures by sequential reductive alkylation
    Patent number: 4900868
    Abstract: Mixtures of N,N'-disubstituted paraphenylenediamines are produced in a process wherein a nitrogen-containing compound such as 4-nitrodiphenylamine is reductively alkylated with a plurality of ketones in sequence. Preferably, one ketone is reacted to completion with an excess of the nitrogen-containing compound, then an excess of a second ketone is added and the reaction is continued until the nitrogen-containing compound is consumed. The product is then separated from the volatiles and the unreacted portion of the second ketone is recovered.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: February 13, 1990
    Assignee: Monsanto Company
    Inventors: Helmut L. Merten, Leona M. Baclawski