Patents Represented by Law Firm Lerner, David, Littenberg & Littenberg
  • Chip treatment
    Patent number: 4356213
    Abstract: A treatment for wood chips in the manufacture of pulp is described. Prior to chip washing, the chips are placed in contact with an impregnation liquid such that all readily fillable cavities in the chips become filled with the liquid. The chips can be steamed prior to the impregnation process to increase the liquid absorption. After the impregnated chips are drained of the excess liquid, no appreciable amount of washing liquid is absorbed by them during a subsequent washing cycle used to remove included gravel and sand.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: October 26, 1982
    Assignee: SCA Development Aktiebolag
    Inventors: Hans E. Hoglund, Per V. Peterson