Patents by Inventor Marco Solinas

Marco Solinas 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).

  • Ozone bleaching with an organic solvent and mineral acid
    Patent number: 5685953
    Abstract: A bleached pulp having a high viscosity for a given permanganate number is formed by pretreating never dried pulp with an organic solvent medium to produce a treated pulp composed of said never dried pulp in the medium and then bleaching that treated pulp using ozone at a pH of 1.5-5 to provide a bleached pulp while reducing the viscosity loss during the ozone bleaching step significantly compared to that what would occur if the medium used in the ozone bleaching were water.
    Type: Grant
    Filed: June 9, 1995
    Date of Patent: November 11, 1997
    Assignee: MacMillan Bloedel Limited
    Inventors: Marco Solinas, Thomas Howard Murphy, Adriaan Reinhard Pieter van Heiningen, Yonghao Ni
  • Oxygen bleaching process for cellulocis pulps with a polyhydric alcohol cellulose protector
    Patent number: 5609723
    Abstract: An improved oxygen bleaching process wherein the pulp is bleached in an aqueous organic medium wherein a polyhydric alcohol constitutes between 10 and 70% by weight of the medium to produce a pulp having a viscosity at least 2.5 cp higher than a similar pulp bleached using the same conditions in an aqueous atmosphere to the same kappa no. of 8 ml.
    Type: Grant
    Filed: June 9, 1995
    Date of Patent: March 11, 1997
    Assignee: MacMillan Bloedel Limited
    Inventors: Marco Solinas, Allan M. Proust
  • Method of bleaching cellulosic pulps with ozone and a protective amount of an N-alkylated urea
    Patent number: 5529662
    Abstract: Cellulosic pulps are bleached with ozone in an ozone bleaching stage in an aqueous medium containing an additive in an effective amount not exceeding 5% weight concentration of the aqueous medium. The additive is selected from a group consisting of N-alkylated ureas, N-alkylated lactams and N-alkylated amides. pH in the Z stage is operated under conventional ozone bleaching conditions, but preferably at high consistency and at low temperature, below 5.degree. C.
    Type: Grant
    Filed: July 6, 1994
    Date of Patent: June 25, 1996
    Assignee: MacMillan Bloedel Limited
    Inventors: Zheng Tan, Marco Solinas
  • Nitric oxide treatment for ozone bleaching
    Patent number: 5364503
    Abstract: A method of bleaching a chemical pulp by adjusting the pH of the pulp to 1.5-3.5, chelating the pulp and then treating the pulp in an N stage with nitric oxide (NO) in the amount of at least 1.5% by weight of the oven dried pulp at a consistency of between 30 and 55% and further treating the pulp in a Z stage with ozone to produce a bleach pulp having a higher viscosity for a given permanganate number compared with a similar pulp bleached without using the N stage.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: November 15, 1994
    Assignee: MacMillan Bloedel Limited
    Inventors: Marco Solinas, Thomas H. Murphy