Patents by Inventor Andrew D. Feilden

Andrew D. Feilden 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).

  • Alkylation process
    Patent number: 5734078
    Abstract: A process for the production of an alkyl salicylic acid in which the alkyl substituent has at least 6 carbon atoms is disclosed, comprising reacting salicylic acid with an olefin having at least 6 carbon atoms at elevated temperature in the presence of sulphuric acid as a catalyst. Lubricating oil additives comprising a metal salt of such alkylated salicylic acids and a process for making them are also disclosed.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: March 31, 1998
    Assignee: BP Chemicals (Additives) Limited
    Inventors: Andrew D. Feilden, David J. Moreton, Charles B. Thomas