Patents by Inventor Stephen P. Erickson

Stephen P. Erickson 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 reclaiming gypsum panels that contain hydrophobic materials and use thereof
    Patent number: 12281045
    Abstract: A method for making a gypsum board including: combining a first plurality of particles including at least about 50 wt. % calcium sulfate dihydrate and about 0.05 wt. % to about 10 wt. % hydrophobic material and having a D50 particle size of about 200 ?m to about 800 ?m with a second plurality of particles including calcium sulfate hemihydrate to form a combined mixture of calcium sulfate; adding water to the combined mixture of calcium sulfate to make an aqueous gypsum slurry; depositing a core layer including the aqueous gypsum slurry over a forming surface; and allowing the core layer to set, thereby forming a set gypsum core.
    Type: Grant
    Filed: March 24, 2021
    Date of Patent: April 22, 2025
    Assignee: KNAUF GIPS KG
    Inventors: Rudy A. Schermann, Annamaria Vilinska, Alfred Li, Blair C. Walker, Te Hua Lau, Stephen P. Erickson, Jose Luis Carrazco, Angel Arturo Rueda
  • METHODS FOR RECLAIMING GYPSUM PANELS THAT CONTAIN HYDROPHOBIC MATERIALS AND USE THEREOF
    Publication number: 20210331978
    Abstract: A method for making a gypsum board including: combining a first plurality of particles including at least about 50 wt. % calcium sulfate dihydrate and about 0.05 wt. % to about 10 wt. % hydrophobic material and having a D50 particle size of about 200 ?m to about 800 ?m with a second plurality of particles including calcium sulfate hemihydrate to form a combined mixture of calcium sulfate; adding water to the combined mixture of calcium sulfate to make an aqueous gypsum slurry; depositing a core layer including the aqueous gypsum slurry over a forming surface; and allowing the core layer to set, thereby forming a set gypsum core.
    Type: Application
    Filed: March 24, 2021
    Publication date: October 28, 2021
    Inventors: Rudy A. Schermann, Annamaria Vilinska, Alfred Li, Blair C. Walker, Te Hua Lau, Stephen P. Erickson, Jose Luis Carrazco, Angel Arturo Rueda