Patents by Inventor Torsten Lindroos

Torsten Lindroos 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 sodium carboxy-methyl cellulose
    Patent number: 4941943
    Abstract: The invention relates to a method and an equipment for preparing NaCMC, in which (a) cellulose is slushed in the reaction medium until a consistency of c. 5-15%, preferably 5-10%, (b) the fibre suspension obtained in step (a) is thickened to a consistency of c. 20-35% and (c) the pulp containing reaction medium obtained in the second step is homogenized by means of a screw conveyor having a screw pitch which decreases from an inlet opening thereof towards an outlet opening thereof, in order to increase the reactivity, whereby a mercerization activating the cellulose is carried out after step (b) and/or (c), and the cellulose thus pretreated is etherified in a manner known per se.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: July 17, 1990
    Assignee: Metsa-Serla Oy
    Inventors: Kari Edelman, Torsten Lindroos