Patents by Inventor Lennart Borjeson

Lennart Borjeson 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: 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
  • Patent number: 9938664
    Abstract: Green liquor clarification comprising filtering of a flowing suspension containing solids, wherein the suspension is brought into contact with a first filter unit (4), said 5 filter unit (4) comprising one or several filter elements (12) comprising one or several filter bodies (3) having filter channels (33) within the filter bodies (3) with a filtering layer (32), a part of the suspension is forced to pass through the filtering layer (32) from a first/inner surface (32A) to a second/outer surface (32B) of the filtering layer (32) forming a filtrate while the solids substantially remains in a residual part of the suspension forming a slurry and where the filtering layer (32) is made of a membrane material with pores, said pores having a pore size of 0.1-10 micrometer, more preferred 0.1-5 micrometer and most preferred 0.2-1.0 micrometer.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: April 10, 2018
    Assignee: CLEANFLOW AB
    Inventors: Mikael Lindstrom, Christofer Lindgren, Lennart Borjeson, Lennart Kallen
  • Publication number: 20170051454
    Abstract: Green liquor clarification comprising filtering of a flowing suspension containing solids, wherein the suspension is brought into contact with a first filter unit (4), said 5 filter unit (4) comprising one or several filter elements (12) comprising one or several filter bodies (3) having filter channels (33) within the filter bodies (3) with a filtering layer (32), a part of the suspension is forced to pass through the filtering layer (32) from a first/inner surface (32A) to a second/outer surface (32B) of the filtering layer (32) forming a filtrate while the solids substantially remains in a residual part of the suspension forming a slurry and where the filtering layer (32) is made of a membrane material with pores, said pores having a pore size of 0.1-10 micrometer, more preferred 0.1-5 micrometer and most preferred 0.2-1.0 micrometer.
    Type: Application
    Filed: June 20, 2016
    Publication date: February 23, 2017
    Applicant: CLEANFLOW AB
    Inventors: Mikael Lindstrom, Christofer Lindgren, Lennart Borjeson, Lennart Kallen
  • Publication number: 20120125849
    Abstract: Green liquor clarification comprising filtering of a flowing suspension containing solids, wherein the suspension is brought into contact with a first filter unit (4), said 5 filter unit (4) comprising one or several filter elements (12) comprising one or several filter bodies (3) having filter channels (33) within the filter bodies (3) with a filtering layer (32), a part of the suspension is forced to pass through the filtering layer (32) from a first/inner surface (32A) to a second/outer surface (32B) of the filtering layer (32) forming a filtrate while the solids substantially remains in a residual part of the suspension forming a slurry and where the filtering layer (32) is made of a membrane material with pores, said pores having a pore size of 0.1-10 micrometer, more preferred 0.1-5 micrometer and most preferred 0.2-1.0 micrometer.
    Type: Application
    Filed: March 30, 2010
    Publication date: May 24, 2012
    Applicant: CLEANFLOW AB
    Inventors: Mikael Lindstrom, Christofer Lindgren, Lennart Borjeson, Lennart Kallen