Patents by Inventor Wyman T. Stephens

Wyman T. Stephens 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).

  • Pre-dried polystyrene/alumina compound for foam extrusion
    Patent number: 11639429
    Abstract: A polystyrene (PS) composition for making an extruded foam, the PS composition comprising: a dried PS/alumina compound comprising a PS and an alumina additive, wherein the dried PS/alumina compound has a moisture content, measured by Coulometer, that is less than or equal to about 0.05 weight percent (wt %); and a blowing agent.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: May 2, 2023
    Assignee: FINA TECHNOLOGY, INC.
    Inventors: Fengkui Li, Jayna Brown, Jon David Tippet, Kenneth P. Blackmon, David W. Knoeppel, John R. Gaustad, Wyman T. Stephens, Ying Wang
  • Polystyrene compositions for foam extrusion
    Patent number: 11414529
    Abstract: A polystyrene (PS) composition for making an extruded foam, the PS composition comprising polystyrene, a blowing agent, and an additive selected from glycerol monostearate (GMS), glycerol tri-stearate (GTS), mineral oil (MO), epoxidized soy oil (ESO), epoxidized polybutadiene, or combinations thereof. Methods of producing a low density polystyrene (PS) foam are also provided.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: August 16, 2022
    Assignee: FINA TECHNOLOGY, INC.
    Inventors: Fengkui Li, Jayna Brown, Ying Wang, Wyman T. Stephens
  • PRE-DRIED POLYSTYRENE/ALUMINA COMPOUND FOR FOAM EXTRUSION
    Publication number: 20210040286
    Abstract: A polystyrene (PS) composition for making an extruded foam, the PS composition comprising: a dried PS/alumina compound comprising a PS and an alumina additive, wherein the dried PS/alumina compound has a moisture content, measured by Coulometer, that is less than or equal to about 0.05 weight percent (wt %); and a blowing agent.
    Type: Application
    Filed: August 4, 2020
    Publication date: February 11, 2021
    Inventors: Fengkui Li, Jayna Brown, Jon David Tippet, Kenneth P. Blackmon, David W. Knoeppel, John R. Gaustad, Wyman T. Stephens, Ying Wang
  • POLYSTYRENE COMPOSITIONS FOR FOAM EXTRUSION
    Publication number: 20190390026
    Abstract: A polystyrene (PS) composition for making an extruded foam, the PS composition comprising polystyrene, a blowing agent, and an additive selected from glycerol monostearate (GMS), glycerol tri-stearate (GTS), mineral oil (MO), epoxidized soy oil (ESO), epoxidized polybutadiene, or combinations thereof. Methods of producing a low density polystyrene (PS) foam are also provided.
    Type: Application
    Filed: June 21, 2018
    Publication date: December 26, 2019
    Inventors: Fengkui Li, Jayna Brown, Ying Wang, Wyman T. Stephens