Patents by Inventor Amy Tran Carlström

Amy Tran Carlström 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).

  • Patent number: 12215459
    Abstract: There is provided a method for separation of fibers in for instance recycled textile, starting with a mixture comprising cellulose fibers and non-cellulose fibers and then reducing the cellulose chain length of the cellulose fibers so that the limiting viscosity number determined according to ISO 5351 is in the interval 200-900 ml/g, mechanically breaking agglomerates of fibers into smaller pieces, adjusting the concentration of fibers to 0.1-4 wt %, and subjecting the mixture to flotation to remove the non-cellulose fibers. Non-cellulosic fibers such as synthetic fibers can be removed very specifically without or essentially without removing cellulose fibers in the mixture. This gives a very high degree of removal and simultaneously the yield is kept high because no or only few cellulose fibers are removed.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: February 4, 2025
    Assignee: CIRCULOSE AB
    Inventors: Michael Ternström, Amy Tran Carlström, Mikael Lindström, Zaheer Ahmad Mansoor
  • Publication number: 20230146394
    Abstract: There is provided a process for chemically pretreating reclaimed cellulose fibres to be used in the production of moulded bodies from regenerated cellulose, wherein the pretreatment includes one stage, in which stage acid metal removal and acid oxidative bleaching are carried out together. Advantages include that the propensity of the regenerated cellulose to clog when flowing in a tube and through a nozzle is reduced. This is believed to be an effect of an efficient metal removal. The need for additional bleaching steps and/or metal removing steps is reduced or even eliminated. A one-stage method is more efficient, faster and less costly compared to a multi-stage method according to the prior art. From an environmental perspective, acidic metal removal is preferred over removal by chelating agents such as EDTA.
    Type: Application
    Filed: March 21, 2021
    Publication date: May 11, 2023
    Inventors: Mikael LINDSTROM, Gunnar HENRIKSSON, Amy TRAN CARLSTROM, Kajsa FOUGNER, Lennart BÖRJESON, Lennart KÄLLÉN, Zaheer Ahmad MANSOOR, Tobias SJÖGREN, Tahani KALDÉUS
  • Publication number: 20230060430
    Abstract: There is provided a method for separation of fibers in for instance recycled textile, starting with a mixture comprising cellulose fibers and non-cellulose fibers and then reducing the cellulose chain length of the cellulose fibers so that the limiting viscosity number determined according to ISO 5351 is in the interval 200-900 ml/g, mechanically breaking agglomerates of fibers into smaller pieces, adjusting the concentration of fibers to 0.1-4 wt %, and subjecting the mixture to flotation to remove the non-cellulose fibers. Non-cellulosic fibers such as synthetic fibers can be removed very specifically without or essentially without removing cellulose fibers in the mixture. This gives a very high degree of removal and simultaneously the yield is kept high because no or only few cellulose fibers are removed.
    Type: Application
    Filed: November 7, 2022
    Publication date: March 2, 2023
    Inventors: Michael TERNSTRÖM, Amy TRAN CARLSTRÖM, Mikael LINDSTRÖM, Zaheer Ahmad MANSOOR
  • Publication number: 20220112658
    Abstract: There is provided a method for separation of fibers in for instance recycled textile, starting with a mixture comprising cellulose fibers and non-cellulose fibers and then reducing the cellulose chain length of the cellulose fibers so that the limiting viscosity number determined according to ISO 5351 is in the interval 200-900 ml/g, mechanically breaking agglomerates of fibers into smaller pieces, adjusting the concentration of fibers to 0.1-4 wt %, and subjecting the mixture to flotation to remove the non-cellulose fibers. Non-cellulosic fibers such as synthetic fibers can be removed very specifically without or essentially without removing cellulose fibers in the mixture. This gives a very high degree of removal and simultaneously the yield is kept high because no or only few cellulose fibers are removed.
    Type: Application
    Filed: December 18, 2019
    Publication date: April 14, 2022
    Inventors: Michael TERNSTRÖM, Amy TRAN CARLSTRÖM, Mikael LINDSTRÖM, Zaheer Ahmad MANSOOR
  • Patent number: 11162222
    Abstract: The present invention relates to a method for manufacturing at least one layer of a film wherein the method comprises the steps of; providing a first suspension comprising microfibrillated cellulose, providing a second suspension comprising microfibrillated dialdehyde cellulose, mixing the first suspension with the second suspension to form a mixture, applying said mixture to a substrate to form a fibrous web and drying said web to form at least one layer of said film. The present invention further relates to a film comprising said at least one layer.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: November 2, 2021
    Assignee: Stora Enso OYJ
    Inventors: Cecilia Land Hensdal, Adrianna Svensson, Liv Bergqvist, Amy Tran Carlström, Lars Axrup
  • Publication number: 20200086604
    Abstract: The present invention relates to a method for manufacturing at least one layer of a film wherein the method comprises the steps of; providing a first suspension comprising microfibrillated cellulose, providing a second suspension comprising microfibrillated dialdehyde cellulose, mixing the first suspension with the second suspension to form a mixture, applying said mixture to a substrate to form a fibrous web and drying said web to form at least one layer of said film. The present invention further relates to a film comprising said at least one layer.
    Type: Application
    Filed: April 11, 2018
    Publication date: March 19, 2020
    Applicant: Stora Enso OYJ
    Inventors: Cecilia Land Hensdal, Adrianna Svensson, Liv Bergqvist, Amy Tran Carlström, Lars Axrup