Patents by Inventor Georg Rachor

Georg Rachor 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).

  • Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO.sub.2 solution prior to defibration
    Patent number: 5338405
    Abstract: In a process for manufacturing chemo-mechanical and/or chemothermal-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alcoholic SO.sub.2 solution and then heated to a temperature between 50.degree. and 170.degree. C. for a period of 1 to 300 minutes. The wood shavings are then ground to the desired degree of fineness in a defibrinating device. The process makes it possible to achieve up to 50% reduction in grinding energy in comparison with known chemothermal-mechanical processes.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: August 16, 1994
    Assignee: Stora Feldmuhle Aktiengesellschaft
    Inventors: Rudolf Patt, Georg Rachor