Patents by Inventor Randi Johansen

Randi Johansen 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).

  • Aqueous dispersions, a process for their preparation and the use of the dispersions as sizing agents
    Patent number: 4816073
    Abstract: Aqueous dispersions of rosin and synthetic sizing agent wherein the particles in the dispersed phase contain a mixture of rosin and the synthetic sizing agent and wherein the dispersions contain a polyaluminum compound. The dispersions are prepared by homogenization of a homogenous mixture of rosin material and the synthetic sizing agent and the polyaluminum compound can either be present at the production or be added to an aqueous dispersion of mixed particles. The dispersions are used as sizing agents at the production of paper, paper board, board and similar products.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: March 28, 1989
    Assignee: Casco Nobel AB
    Inventors: Ulla Helmer, Randi Johansen, Ulf Carlson
  • Aqueous dispersions, a process for their preparation and the use of the dispersions as sizing agents
    Patent number: 4743303
    Abstract: Aqueous cationic or anionic dispersions of rosin and certain synthetic sizing agents, carbamoyl chlorides, ketene dimers or acid anhydrides. The particles in the dispersed phase contain a mixture of rosin and synthetic sizing agent and the dispersions are prepared by homogenisation of a homogeneous mixture of the rosin material and the synthetic sizing agent in the presence of a dispersing agent. The dispersions are used as sizing agents in the production of paper, paper board, board and similar products.
    Type: Grant
    Filed: July 2, 1986
    Date of Patent: May 10, 1988
    Assignee: Casco Nobel AB
    Inventors: Ulla Helmer, Randi Johansen