Patents by Inventor Helen M. Doherty

Helen M. Doherty 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).

  • Reduced emissions transportation fuel
    Patent number: 7270687
    Abstract: Transportation fuels are provided that have reduced toxics, VOC and NOx emissions, as well as, reduced sulfur content. The transportation fuels provided meet emissions reduction requirements determined by using the EPA Complex Model and for reduced sulfur. Reduction in sulfur content allows the use of components with high concentrations of olefins, while still reducing toxics, hydrocarbon (VOCs) and NOx emissions to acceptable levels.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: September 18, 2007
    Assignee: Sunoco, Inc.
    Inventors: Helen M. Doherty, H. Randolph Roehl
  • Reduced emissions transportation fuel
    Publication number: 20030019787
    Abstract: Transportation fuels are provided that have reduced toxics, VOC and NOx emissions, as well as, reduced sulfur content. The transportation fuels provided meet emissions reduction requirements determined by using the EPA Complex Model and for reduced sulfur. Reduction in sulfur content allows the use of components with high concentrations of olefins, while still reducing toxics, hydrocarbon (VOCs) and NOx emissions to acceptable levels.
    Type: Application
    Filed: May 15, 2001
    Publication date: January 30, 2003
    Inventors: Helen M. Doherty, H. Randolph Roehl