Patents by Inventor Kaarlo Johannes Niskanen

Kaarlo Johannes Niskanen 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 preparing base paper for fine paper
    Patent number: 6406592
    Abstract: The present invention concerns a method for producing a base paper for fine papers, the base paper being produced from a mixture of a mechanical pulp and a chemical pulp. The chemical pulp used comprises a chemical softwood pulp having a elastic modulus close to that of the mechanical pulp and a great bonding strength. It is preferred to use a chemical softwood pulp which produces a sheet having a elastic modulus of less than 6000 N/mm2 when the bonding strength is 400 J/m2. A pulp of this kind has a good ScottBond strength at the same light scattering. The base paper produced by the method can therefore be used in double-coated fine papers which require a large bonding strength of the base paper.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: June 18, 2002
    Assignee: M-real Oyj
    Inventors: Markku Leskelä, Kaarlo Johannes Niskanen, Stina Nygård, Maija Pitkänen
  • PROCESS FOR PREPARING BASE PAPER FOR FINE PAPER
    Publication number: 20010008178
    Abstract: The present invention concerns a method for producing a base paper for fine papers, the base paper being produced from a mixture of a mechanical pulp and a chemical pulp. The chemical pulp used comprises a chemical softwood pulp having a elastic modulus close to that of the mechanical pulp and a great bonding strength. It is preferred to use a chemical softwood pulp which produces a sheet having a elastic modulus of less than 6000 N/mm2 when the bonding strength is 400 J/m2. A pulp of this kind has a good ScottBond strength at the same light scattering. The base paper produced by the method can therefore be used in double-coated fine papers which require a large bonding strength of the base paper.
    Type: Application
    Filed: September 16, 1998
    Publication date: July 19, 2001
    Inventors: MARKKU LESKELA, KAARLO JOHANNES NISKANEN, STINA NYGARD, MAIJA PITKANEN