Patents by Inventor Dorothy-Grace Manarang-Pena

Dorothy-Grace Manarang-Pena 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).

  • Heat stable orange laked monoazo pigment
    Patent number: 6387170
    Abstract: An orange laked monoazo pigment has the following formula (I): wherein M is an alkaline metal selected from the group consisting of calcium, barium, strontium, magnesium and manganese.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: May 14, 2002
    Assignee: Dominion Colour Corporation
    Inventors: Alan Gray, Henry Lui, Dorothy-Grace Manarang-Pena