Patents by Inventor Mary Grass

Mary Grass 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).

  • Methods for removal of impurities from limestone and calcium oxide during the production of hydrated lime
    Patent number: 11772980
    Abstract: Systems and methods for impurity removal to limestone using modifications to the typical calcination process of turning calcium carbonate into calcium oxide prior to slaking to produce calcium hydroxide. Specifically, substantially increasing the temperature to 1100° C. or higher and increasing soak time can result in reductions in certain undesirable impurities, particularly with regards to lead and lead compounds.
    Type: Grant
    Filed: August 3, 2022
    Date of Patent: October 3, 2023
    Assignee: Mississippi Lime Company
    Inventors: Martin L. Gran, Randy Griffard, Mary Grass
  • SYSTEMS AND METHODS FOR REMOVAL OF LEAD AND/OR OTHER CONTAMINANTS FROM LIMESTONE AND RESULTANT CALCIUM OXIDE AND HYDRATED LIME
    Publication number: 20220371907
    Abstract: Systems and methods for impurity removal to limestone using modifications to the typical calcination process of turning calcium carbonate into calcium oxide. Specifically, substantially increasing the temperature to 1100° C. or higher and increasing soak time can result in reductions in certain undesirable impurities, particularly with regards to lead and lead compounds.
    Type: Application
    Filed: August 3, 2022
    Publication date: November 24, 2022
    Inventors: Martin L. Gran, Randy Griffard, Mary Grass
  • Methods for removal of lead and/or other contaminants from limestone and resultant calcium oxide
    Patent number: 11420878
    Abstract: Systems and methods for impurity removal to limestone using modifications to the typical calcination process of turning calcium carbonate into calcium oxide. Specifically, substantially increasing the temperature to 1100° C. or higher and increasing soak time can result in reductions in certain undesirable impurities, particularly with regards to lead and lead compounds.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: August 23, 2022
    Assignee: Mississippi Lime Company
    Inventors: Martin L. Gran, Randy Griffard, Mary Grass
  • SYSTEMS AND METHODS FOR REMOVAL OF LEAD AND/OR OTHER CONTAMINANTS FROM LIMESTONE AND RESULTANT CALCIUM OXIDE AND HYDRATED LIME
    Publication number: 20200262710
    Abstract: Systems and methods for impurity removal to limestone using modifications to the typical calcination process of turning calcium carbonate into calcium oxide. Specifically, substantially increasing the temperature to 1100° C. or higher and increasing soak time can result in reductions in certain undesirable impurities, particularly with regards to lead and lead compounds.
    Type: Application
    Filed: February 19, 2020
    Publication date: August 20, 2020
    Inventors: Martin L. Gran, Randy Griffard, Mary Grass