Patents by Inventor Robert Bruce Calvert

Robert Bruce Calvert 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).

  • Automotive lubricant composition
    Patent number: 8470752
    Abstract: Lubricant compositions for use in automotive engine oils comprising a combination of a specific base stock or mixture of base stocks and a friction reducing additive to improve fuel economy and fuel economy longevity of the automotive engine oil. The friction reducing additive is a specific partial polyol ester and may also include a specific saturated primary amide.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: June 25, 2013
    Assignees: Croda Americas LLC, Croda International PLC
    Inventors: Christopher Donaghy, Robert Bruce Calvert, Andrew Simon Oldfield