Patents by Inventor Hanna HOFFREN

Hanna HOFFREN 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).

  • Process for the preparation of a mixture of chelating agents, mixture of chelating agents and methods of using them
    Patent number: 11225456
    Abstract: The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: January 18, 2022
    Assignee: Kemira Oyj
    Inventors: Reijo Aksela, Jonas Konn, Anna-Maija Perander, Anna Haarala, Riitta Ilmoniemi, Hanna Hoffren
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200223786
    Abstract: The present invention relates to a process for the in situ preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine with maleic acid and then with 2-halocarboxylic acid, mixtures obtainable using said process and mixtures of chelating agents. In addition, the invention relates to methods where such mixtures are used.
    Type: Application
    Filed: June 27, 2018
    Publication date: July 16, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200181063
    Abstract: The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents.
    Type: Application
    Filed: June 27, 2018
    Publication date: June 11, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN