Patents Assigned to Kopparfors AB
  • Method of pulping with sulfite liquor containing formic acid esters
    Patent number: 4094735
    Abstract: In the sulfite pulping, the yield of pulp is increased, if at least one of a selected group of formic acid esters is added to the cooking liquid before the impregnation of the wood.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: June 13, 1978
    Assignee: Kopparfors AB
    Inventor: Sigbjorn P. H. E. Holgersson