Patents by Inventor Joseph David Schroeder

Joseph David Schroeder 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).

  • LACTIDE COMPOSITIONS AND POLYLACTIDES MADE THEREFROM
    Publication number: 20240076443
    Abstract: Lactide compositions contain enumerated amounts of one or more impurities. The lactide compositions can be polymerized to form good quality polylactides despite the presence of these impurities. Some of the impurities pass through the polymerization process whereas some are partially or entirely removed and are therefore present in reduced quantities in the polymer if present at all. Conversely, some impurities are concentrated in the polymer.
    Type: Application
    Filed: November 10, 2023
    Publication date: March 7, 2024
    Inventor: Joseph David Schroeder
  • FAST-HYDROLYZING POLYLACTIDE RESIN COMPOSITIONS
    Publication number: 20220235222
    Abstract: Polylactide resin compositions that exhibit rapid hydrolysis rates and leave small amounts of residuals include a poly(meso-lactide) and a second polylactide. The polylactide resin compositions are useful in applications in which rapid hydrolysis is wanted under mildly to moderately elevated temperatures, such as in certain oil & gas well treatment applications.
    Type: Application
    Filed: May 25, 2020
    Publication date: July 28, 2022
    Inventors: James Russell Valentine, Joseph David Schroeder, Krag Ellis Anderson, Manuel A.W. Natal, Oliver J. Palardy
  • Process for making esters of 2-acetoxyalkanoic acids using a 3,6-dialkyl-1,4-dioxane-2,5-dione or poly-(alpha-hydroxyalkanoic acid) as a starting material
    Patent number: 10414714
    Abstract: 2-Acetoxyalkanoic acid esters are made in a reaction of a 3,6-dialkyl-1,4-dioxane-2,5-dione or a poly(?-hydroxyalkanoic acid), an acetate ester and an alcohol or phenol in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: September 17, 2019
    Assignee: NatureWorks LLC
    Inventors: Aman Kulshrestha, Joseph David Schroeder
  • Process for making esters of 2-acetoxyalkanoic acids using a 3,6-dialkyl-1,4-dioxane-2,5-dione or poly-(alpha-hydroxyalkanoic acid) as a starting material
    Patent number: 10385002
    Abstract: 2-Acetoxyalkanoic acid esters are made in a reaction of a 3,6-dialkyl-1,4-dioxane-2,5-dione or a poly(?-hydroxyalkanoic acid), an acetate ester and an alcohol or phenol in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: August 20, 2019
    Assignee: NatureWorks LLC
    Inventors: Aman Kulshrestha, Joseph David Schroeder
  • Process for making esters of 2-acetoxyalkanoic acids using an ?-hydroxyalkanoic acid ester and an acetate ester as starting materials
    Patent number: 10294188
    Abstract: 2-Acetoxyalkanoic acid esters are made in a reaction of an ?-hydroxyalkanoic acid ester and an acetate ester in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: May 21, 2019
    Assignee: NatureWorks LLC
    Inventors: Aman Kulshrestha, Joseph David Schroeder, Steven Scott Bray
  • PROCESS FOR MAKING ESTERS OF 2-ACETOXYALKANOIC ACIDS USING A 3,6-DIALKYL-1,4-DIOXANE-2,5-DIONE OR POLY-(ALPHA-HYDROXYALKANOIC ACID) AS A STARTING MATERIAL
    Publication number: 20180208537
    Abstract: 2-Acetoxyalkanoic acid esters are made in a reaction of a 3,6-dialkyl-1,4-dioxane-2,5-dione or a poly(?-hydroxyalkanoic acid), an acetate ester and an alcohol or phenol in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
    Type: Application
    Filed: March 21, 2018
    Publication date: July 26, 2018
    Applicant: NatureWorks LLC
    Inventors: Aman Kulshrestha, Joseph David Schroeder
  • PROCESS FOR MAKING ESTERS OF 2-ACETOXYALKANOIC ACIDS USING A 3,6-DIALKYL-1,4-DIOXANE-2,5-DIONE OR POLY-(ALPHA-HYDROXYALKANOIC ACID) AS A STARTING MATERIAL
    Publication number: 20170066708
    Abstract: 2-Acetoxyalkanoic acid esters are made in a reaction of a 3,6-dialkyl-1,4-dioxane-2,5-dione or a poly(?-hydroxyalkanoic acid), an acetate ester and an alcohol or phenol in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
    Type: Application
    Filed: February 23, 2015
    Publication date: March 9, 2017
    Inventors: Aman Kulshrestha, Joseph David Schroeder
  • PROCESS FOR MAKING ESTERS OF 2-ACETOXYALKANOIC ACIDS USING AN ALPHA-HYDROXYALKANOIC ACID ESTER AND AN ACETATE ESTER AS STARTING MATERIALS
    Publication number: 20170066709
    Abstract: 2-Acetoxyalkanoic acid esters are made in a reaction of an ?-hydroxyalkanoic acid ester and an acetate ester in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
    Type: Application
    Filed: February 23, 2015
    Publication date: March 9, 2017
    Inventors: Aman Kulshrestha, Joseph David Schroeder, Steven Scott Bray
  • Method for making copolymers of lactide and a 1:4-3:6 dianhydrohexitol
    Patent number: 8268954
    Abstract: Polyester-carbonate copolymers are prepared by copolymerizing lactide with a 1:4-3:6 dianhydrohexitol in the presence of a carbonate precursor and a polymerization catalyst. The copolymers have an elevated glass transition temperature, relative to polylactide resins.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: September 18, 2012
    Assignee: NatureWorks LLC
    Inventor: Joseph David Schroeder
  • METHOD FOR MAKING COPOLYMERS OF LACTIDE AND A 1:4-3:6 DIANHYDROHEXITOL
    Publication number: 20100197884
    Abstract: Polyester-carbonate copolymers are prepared by copolymerizing lactide with a 1:4-3:6 dianhydrohexitol in the presence of a carbonate precursor and a polymerization catalyst. The copolymers have an elevated glass transition temperature, relative to polylactide resins.
    Type: Application
    Filed: August 7, 2008
    Publication date: August 5, 2010
    Inventor: Joseph David Schroeder