Patents by Inventor Stig V. Renvall

Stig V. Renvall 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).

  • High gloss and high bulk paper
    Patent number: 7070679
    Abstract: The invention teaches a method of manufacturing a high bulk, high gloss paperweb using a supercalender operation. A paperweb surface is coated with a plastic pigment. The paperweb is run through a multi-nip calender device wherein the nip load of the paperweb is maintained at a load of about 1,000 pounds per linear inch at each nip. The temperature of the hard rolls are about 450 degrees Farenheit or less.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: July 4, 2006
    Assignee: NewPage Corporation
    Inventors: David B. Cason, S. Craig Petro, Stig V. Renvall, Bhima Sastri
  • Method of producing high gloss paper
    Publication number: 20030121634
    Abstract: The invention teaches a method of manufacturing a high bulk, high gloss paperweb using a supercalender operation. A paperweb surface is coated with a plastic pigment. The paperweb is run through a multi-nip calender device wherein the nip load of the paperweb is maintained at a load of about 1,000 pounds per linear inch at each nip. The temperature of the hard rolls are about 450 degrees Farenheit or less.
    Type: Application
    Filed: January 16, 2003
    Publication date: July 3, 2003
    Inventors: David B. Cason, S. Craig Petro, Stig V. Renvall, Bhima Sastri
  • Method of producing high gloss paper
    Patent number: 6531183
    Abstract: A method of forming a finished paper having high gloss while maintaining high bulk, comprising applying on a surface of a base stock at least one layer of a coating formulation comprising a particulate plastic pigment; and passing the base stock through a multi-nip calender device maintained at relatively low roll temperature and nip pressure. The product formed using this coating formulation and process is of high gloss quality, yet maintains a relatively high bulk, in comparison to high gloss papers produced by conventional methods.
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: March 11, 2003
    Assignee: MeadWestvaco Corporation
    Inventors: David B. Cason, S. Craig Petro, Stig V. Renvall, Bhima S. Sastri