Patents by Inventor Anthony M. Scallan

Anthony M. Scallan 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).

  • Method for producing pulp and paper with calcium carbonate filler
    Patent number: 6235150
    Abstract: A method is described for attaining high levels of loading of calcium carbonate fillers in the lumens of wood pulp fibers. The pulp is pretreated with a cationic polymer prior to being impregnated with the filler. Different conditions of pH and temperature are specified depending on whether the filler is a precipitated calcium carbonate or a ground calcium carbonate. The lumen-loaded pulps are used to make novel products with advantages in higher filler retention and sheet strength over conventionally made papers.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: May 22, 2001
    Assignee: Pulp and Paper Research Institute of Canada
    Inventors: Steven R. Middleton, Josée Desmeules, Anthony M. Scallan
  • Method for the deacidification of papers and books
    Patent number: 5433827
    Abstract: Acidic papers, books, and other sheets of cellulosic material may be deacidified and so given a prolonged life by bringing the papers, books, or other sheets of cellulosic material to be treated in intimate contact with a source of solid alkali such as calcium carbonate filled paper, at an elevated humidity and under mechanical pressure for a period long enough to produce deacidification; the process differs from other processes in that it is carried out in the solid state without the use of liquid or gaseous reactants.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: July 18, 1995
    Assignee: Pulp and Paper Research Institute of Canada
    Inventors: Derek H. Page, Anthony M. Scallan, Steven R. Middleton, Xuejun Zou
  • Lumen-loaded paper pulp, its production and use
    Patent number: 4510020
    Abstract: Paper of improved properties is produced from pulp in which filler is selectively loaded within the fiber lumens by agitating a suspension of pulp and filler until the fiber lumens become loaded with filler, separating the residual suspended filler from the loaded fibers and vigorously washing the pulp until substantially all of the filler on the external surfaces of the fibers is removed.
    Type: Grant
    Filed: June 12, 1980
    Date of Patent: April 9, 1985
    Assignee: Pulp and Paper Research Institute of Canada
    Inventors: Harold V. Green, Thomas J. Fox, Anthony M. Scallan