Patents Assigned to Firma Holmen GmbH
  • Flowing agent for concrete and mortar and process for producing the same
    Patent number: 4239550
    Abstract: Flowing agent for concrete and mortar based, on the one hand, on lignin sulfonate and, on the other hand, on ring-sulfonated or sulfomethylated aromatic substances, wherein the mixture of the basic ingredients is after-condensed and after-sulfitized. The invention also relates to a process for making the flowing agent.
    Type: Grant
    Filed: January 26, 1979
    Date of Patent: December 16, 1980
    Assignee: Firma Holmen GmbH
    Inventor: Leo Kohler