Patents by Inventor Anna Linnea Holmberg

Anna Linnea Holmberg 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 stabilizing the PH of a pulp suspension and for producing paper from the stabilized pulp
    Patent number: 6991705
    Abstract: The invention relates to a process for stabilizing the pH of a pulp suspension with buffering agents and to a process for producing paper from a stabilized pulp suspension. The alkalinity of the pulp suspension is increased by a combination of an alkali metal hydroxide feed and a carbon dioxide feed. Said feeds provide a significant buffering effect which stablilizes the pH of said pulp suspension for the paper making process.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: January 31, 2006
    Assignee: Aga Aktiebolag
    Inventors: Hannu Juhani Leino, Anna Linnea Holmberg
  • PROCESS FOR STABILIZING THE PH OF A PULP SUSPENSION AND FOR PRODUCING PAPER FROM THE STABILIZED PULP
    Publication number: 20030150570
    Abstract: The invention relates to a process for stabilizing the pH of a pulp suspension with buffering agents and to a process for producing paper from a stabilized pulp suspension. The alkalinity of the pulp suspension is increased by a combination of an alkali metal hydroxide feed and a carbon dioxide feed. Said feeds provide a significant buffering effect which stablilizes the pH of said pulp suspension for the paper making process.
    Type: Application
    Filed: March 13, 2000
    Publication date: August 14, 2003
    Inventors: HANNU JUHANI LEINO, ANNA LINNEA HOLMBERG
  • Process for improving the drainage of cellulosic pulps by adding carbon dioxide directly into the pulp
    Patent number: 6589387
    Abstract: The invention relates to a process for improving the drainage or dewatering of cellulosic pulp suspensions in a paper making machine, a drying machine or the like assembly. The invention also relates to a process for producing a dried cellulosic product from said pulp suspension. The drainage of said pulp suspension is improved by treating it with carbon dioxide just prior to its entering a dewatering device such as the wire section of a paper machine.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: July 8, 2003
    Assignee: AGA Aktiebolag
    Inventors: Hannu Juhani Leino, Anna Linnea Holmberg