Patents by Inventor Kalena STOVALL

Kalena STOVALL 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).

  • Publication number: 20200325344
    Abstract: This disclosure describes a process for producing a surface-modified calcium carbonate, the process comprising contacting a calcium carbonate or precursor thereof with at least one amphiphilic copolymer comprising hydrophilic subunits and hydrophobic subunits, in which the hydrophilic subunits derive from at least one ethylenically-unsaturated compound comprising a carboxylic acid group or salt or derivative thereof; the hydrophobic subunits derive from at least one ethylenically-unsaturated compound comprising a hydrophobic group; and the amphiphilic copolymer has a hydrophilic-lipophilic balance ranging from about 1 to about 40. Surface-modified calcium carbonates obtained from the process are also described, as well as compositions containing the surface-modified calcium carbonates.
    Type: Application
    Filed: December 21, 2018
    Publication date: October 15, 2020
    Inventors: Virendra SINGH, Kalena STOVALL, Parvin GOLBAYANI, Richardo M. PEREZ, David A. TAYLOR, Christopher D. PAYNTER, Douglas WICKS, Petra FRITZEN, Anaelle GIRARD
  • Publication number: 20200308318
    Abstract: The disclosure describes the preparation and use of reactive carbonates containing a metal carbonate bound to a reactive compound, wherein the reactive compound comprises a mineral binding group and a polymer reactive group connected together by a linking group. Such reactive carbonates are useful as reagents in processes for making mineral-bound elastomeric materials, and in methods for reducing cavitation in elastomer materials.
    Type: Application
    Filed: October 10, 2018
    Publication date: October 1, 2020
    Inventors: Douglas WICKS, Kalena STOVALL, Sang Jin PARK, Virenda SINGH
  • Patent number: 10399862
    Abstract: A process for treating a sulfurous fluid to form gypsum and magnesium carbonate, whereby the sulfurous fluid is scrubbed with a sequestrating agent to yield a scrubbed fluid, gypsum and magnesium sulfate. The flue gas desulfurized gypsum is isolated from the magnesium sulfate solution by filtration or centrifugation. The magnesium sulfate is reacted with a carbonate salt to produce a magnesium carbonate whereby the reaction conditions are controlled to control the properties of the magnesium carbonate produced.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: September 3, 2019
    Assignee: Imerys USA, Inc.
    Inventors: Christopher Paynter, Kalena Stovall, Douglas Wicks, Gavin Butler-Lee, Parvin Golbayani, Nigel Victor Jarvis, Graham M. Pring, David Taylor, Ricardo M. Perez
  • Publication number: 20180265370
    Abstract: A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at least one carbonate source, whereby precipitated calcium carbonate is produced in the form of calcite and/or aragonite directly without conversion from a vaterite polymorph. Also, a process for converting gypsum into precipitated calcium carbonate including providing a mixture comprising i) gypsum ii) a seed, a mineral acid, or both iii) at least one additive selected from the group consisting of ammonium sulfate, an organic acid, or an iron material, and reacting the mixture with at least one carbonate source to produce precipitated calcium carbonate in the form of vaterite. The precipitated calcium carbonates having desired and unique compositions, polymorph and crystal size characteristics formed by these processes.
    Type: Application
    Filed: January 14, 2016
    Publication date: September 20, 2018
    Inventors: Christopher PAYNTER, Kalena STOVALL, Douglas WICKS, Gavin BUTLER-LEE, Parvin GOLBAYANI, Nigel Victor JARVIS, Graham M. PRING, David TAYLOR, Ricardo M. PEREZ
  • Publication number: 20180265371
    Abstract: A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at least one carbonate source, whereby precipitated calcium carbonate is produced in the form of calcite and/or aragonite directly without conversion from a vaterite polymorph. Also, a process for converting gypsum into precipitated calcium carbonate including providing a mixture comprising i) gypsum ii) a seed, a mineral acid, or both iii) at least one additive selected from the group consisting of ammonium sulfate, an organic acid, or an iron material, and reacting the mixture with at least one carbonate source to produce precipitated calcium carbonate in the form of vaterite. The precipitated calcium carbonates having desired and unique composition, polymorph and crystal size characteristics formed by these processes.
    Type: Application
    Filed: January 14, 2016
    Publication date: September 20, 2018
    Inventors: Christopher PAYNTER, Kalena STOVALL, Douglas WICKS, Gavin BUTLER-LEE, Parvin GOLBAYANI, Nigel Victor JARVIS, Graham M. PRING, David TAYLOR, Ricardo M. PEREZ
  • Publication number: 20180022614
    Abstract: A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at least one carbonate source, whereby precipitated calcium carbonate is produced in the form of calcite and/or aragonite directly without conversion from a vaterite polymorph. Also, a process for converting gypsum into precipitated calcium carbonate including providing a mixture comprising i) gypsum ii) a seed, a mineral acid, or both iii) at least one additive selected from the group consisting of ammonium sulfate, an organic acid, or an iron material, and reacting the mixture with at least one carbonate source to produce precipitated calcium carbonate in the form of vaterite.
    Type: Application
    Filed: January 14, 2016
    Publication date: January 25, 2018
    Inventors: Christopher PAYNTER, Kalena STOVALL, Douglas WICKS, Gavin BUTLER-LEE, Parvin GOLBAYANI, Nigel Victor JARVIS, Graham M. PRING, David TAYLOR, Ricardo M. PEREZ
  • Publication number: 20180002187
    Abstract: A process for treating a sulfurous fluid to form gypsum and magnesium carbonate, whereby the sulfurous fluid is scrubbed with a sequestrating agent to yield a scrubbed fluid, gypsum and magnesium sulfate. The flue gas desulfurized gypsum is isolated from the magnesium sulfate solution by filtration or centrifugation. The magnesium sulfate is reacted with a carbonate salt to produce a magnesium carbonate whereby the reaction conditions are controlled to control the properties of the magnesium carbonate produced.
    Type: Application
    Filed: January 14, 2016
    Publication date: January 4, 2018
    Applicant: Imerys USA, Inc.
    Inventors: Christopher PAYNTER, Kalena STOVALL, Douglas WICKS, Gavin BUTLER-LEE, Parvin Golbayani, Nigel Victor JARVIS, Graham M. PRING, David TAYLOR, Ricario M. PEREZ
  • Publication number: 20170369329
    Abstract: A process for converting natural calcium carbonate into precipitated calcium carbonate, involving treating the natural calcium carbonate with a sulfate to produce a gypsum and reacting the gypsum with at least one carbonate source to produce precipitated calcium carbonate. The crystalline polymorph, particle size, and various other characteristics of the precipitated calcium carbonate are controlled by varying conditions during the reacting. Since the natural calcium carbonate is not calcined, the process relates to a low energy method of producing precipitated calcium carbonate of controlled polymorph and particle size with limestone, marble, or chalk as the calcium source.
    Type: Application
    Filed: January 14, 2016
    Publication date: December 28, 2017
    Inventors: Christopher PAYNTER, Kalena STOVALL, Douglas WICKS, Gavin BUTLER-LEE, Parvin GOLBAYANI, Nigel Victor JARVIS, Graham M. PRING, David TAYLOR, Ricardo M. PEREZ