Patents by Inventor Tapio Vehmas

Tapio Vehmas 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: 20220230771
    Abstract: The present invention relates to a method for treating waste material comprising organic components and low and/or medium level radioactive agents. The method comprises encapsulating the waste material into a matrix, gasifying the waste material at a temperature between 600 and 950° C. to form a gaseous fraction and a solid fraction comprising low and/or medium level radioactive agents and combustion residues of the organic components and encapsulating the solid fraction by a geopolymer matrix comprising metakaolin.
    Type: Application
    Filed: May 6, 2020
    Publication date: July 21, 2022
    Inventors: Tapio VEHMAS, Markku LEIVO, Matti NIEMINEN, Jaana LAATIKAINEN-LUNTAMA, Markus OLIN
  • Publication number: 20220230772
    Abstract: The present invention relates to a method for treating waste material comprising organic components and low and/or intermediate level radioactive agents. The method comprises adding material comprising fibers and kaolin to the waste material in order to form a starting material, and gasifying the starting material at a temperature between 600 and 950° C. to form a gaseous fraction and a solid fraction comprising low and/or intermediate level radioactive agents, gasification residues of the organic components and metakaolin. The present invention also relates to a use of mate-rial comprising fibers and kaolin.
    Type: Application
    Filed: May 4, 2020
    Publication date: July 21, 2022
    Inventors: Matti NIEMINEN, Tapio VEHMAS, Markku LEIVO, Jaana LAATIKAINEN-LUNTAMA, Markus OLIN
  • Publication number: 20220120035
    Abstract: According to an example aspect of the present invention, there is provided a method for producing an oxidised lignin based high performance surface active agent in techno-economically feasible manner within kraft pulp mill without interfering the main process.
    Type: Application
    Filed: January 31, 2020
    Publication date: April 21, 2022
    Inventors: Lauri Pehu-Lehtonen, Pauliina Sjögård, Outi Poukka, Katariina Kemppainen, Anna Kalliola, Tiina Liitiä, Tapio Vehmas
  • Publication number: 20180327311
    Abstract: According to an example aspect of the present invention, there is provided a dispersant comprising alkaline-O2 oxidized lignin. Such dispersant may be used for example in inorganic pigments to reduce interactions between pigment particles and lower the viscosity of pigment mixtures, and thereby positively affect for example to the loading of fillers and pigments in paints and coatings, paper and board, constructions materials, printing inks and plastics. Dispersants may also be used in aiding the inorganic pigment grinding in the pigment mine. Another suitable use is as a plasticizer or as a retardant agent for construction materials, such as gypsum.
    Type: Application
    Filed: November 7, 2016
    Publication date: November 15, 2018
    Inventors: Anna Kalliola, Tiina Liitiä, Tarja Tamminen, Tapio Vehmas
  • Patent number: 9676667
    Abstract: The present invention concerns a process for oxidizing lignin at alkaline conditions. This oxidized lignin can be used as a dispersant in various end-products, for example as a renewable plasticizer in cement-containing products, such as concrete, where the ability of the oxidized lignin to endure alkaline conditions is an advantage. Further, the invention concerns a concrete mixture containing aggregate, cement, water and a plasticizer formed of oxidized lignin, and a process for producing such a concrete mixture. The oxidized lignin can be manufactured using a process, where the lignin starting material is reacted with an oxidizing agent in solution in alkaline conditions.
    Type: Grant
    Filed: October 2, 2014
    Date of Patent: June 13, 2017
    Assignee: Teknologian tutkimuskeskus VTT Oy
    Inventors: Anna Kalliola, Tiina Liitiä, Tarja Tamminen, Tapio Vehmas
  • Publication number: 20160244364
    Abstract: The present invention concerns a process for oxidizing lignin at alkaline conditions. This oxidized lignin can be used as a dispersant in various end-products, for example as a renewable plasticizer in cement-containing products, such as concrete, where the ability of the oxidized lignin to endure alkaline conditions is an advantage. Further, the invention concerns a concrete mixture containing aggregate, cement, water and a plasticizer formed of oxidized lignin, and a process for producing such a concrete mixture. The oxidized lignin can be manufactured using a process, where the lignin starting material is reacted with an oxidizing agent in solution in alkaline conditions.
    Type: Application
    Filed: October 2, 2014
    Publication date: August 25, 2016
    Inventors: Anna Kalliola, Tiina Liitiä, Tarja Tamminen, Tapio Vehmas