Patents by Inventor Tapio Vihervaara

Tapio Vihervaara 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).

  • Additive for paper making
    Patent number: 7094319
    Abstract: The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 meq/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: August 22, 2006
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Tapio Vihervaara, Kari Luukkonen, Veikko Niinivaara
  • Additive for paper making
    Publication number: 20040188048
    Abstract: The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 meq/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.
    Type: Application
    Filed: January 30, 2004
    Publication date: September 30, 2004
    Inventors: Tapio Vihervaara, Kari Luukkonen, Veikko Niinivaara
  • Additive for paper making
    Patent number: 6716313
    Abstract: The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 meq/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: April 6, 2004
    Assignee: Raisio Chemicals, Ltd.
    Inventors: Tapio Vihervaara, Kari Luukkonen, Veikko Niinivaara
  • Additive for paper making
    Publication number: 20030041988
    Abstract: The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 meq/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.
    Type: Application
    Filed: April 30, 2002
    Publication date: March 6, 2003
    Inventors: Tapio Vihervaara, Kari Luukkonen, Veikko Niinivaara
  • Additive for paper making
    Patent number: 6398912
    Abstract: The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 mEkv/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.
    Type: Grant
    Filed: January 9, 2001
    Date of Patent: June 4, 2002
    Assignee: Raisio Chemicals Ltd.
    Inventors: Tapio Vihervaara, Kari Luukkonen, Veikko Niinivaara
  • Rosin emulsion including starch derivative for paper sizing
    Patent number: 6290765
    Abstract: A “one-shot” composition for use in paper sizing comprises an admixture of a rosin emulsion, a soluble aluminium salt and a cationic starch derivative which has a charged state of 1.0 to 3.5 m equivalents per gramme and which is produced by a process in which the starch structure was split prior to the cationising step.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: September 18, 2001
    Assignee: Raisio Chemicals Limited UK
    Inventors: Michael James Jaycock, Martin Derek Phillipson, Claes Zetter, Tapio Vihervaara
  • Reducing level of interference chemicals in water circulation of wood-based fibre suspension processes
    Patent number: 5578169
    Abstract: The invention relates to a method for reducing the amount of interference substances in the water circulations of processes involving wood-based fibre suspensions by binding the disturbance substances to the fibres by means of cationic starch. The amount of the said starch added to the fibre suspension is approximately 0.04-0.5% of the fibre weight.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: November 26, 1996
    Assignee: Raision Tehtaat OY AB
    Inventor: Tapio Vihervaara