Patents by Inventor Rodney Frederick Lloyd

Rodney Frederick Lloyd 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).

  • Reductive alkylation of polyamines
    Patent number: 5646235
    Abstract: A method is provided for the preparation of tertiary polyamines by alkylating a polyamine having at least two primary amino groups without the use of excess solvent. More particularly, a tertiary amine is produced by reductively alkylating a polyamine with a carbonyl compound, such as formaldehyde, in a reaction zone while in the presence of a hydrogenation catalyst and hydrogen under reductive conditions. The carbonyl compound is continuously supplied to the reaction zone.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: July 8, 1997
    Assignee: Huntsman Petrochemical Corporation
    Inventors: Robert LeRoy Zimmerman, Wheeler Conrad Crawford, Rodney Frederick Lloyd