Patents by Inventor Lars T. Nelvig

Lars T. Nelvig 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).

  • Method and apparatus for controlling wood pulp grinding machines
    Patent number: 4294412
    Abstract: Disclosed herein are apparatus and method for measuring, during operation, the degree of sharpness of grindstones in a wood pulp grinding machine of the type where one motor drives two grindstones, each having two or more pockets for loading timber. In accordance with the apparatus and method, the power of the motor and the feed rates of the pockets are simultaneously measured. After a predetermined time interval, during which the operating conditions of the machine change, these measurements are made again. The degree of sharpness of the grindstones can then be calculated using the measured values of power and feed rates.
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: October 13, 1981
    Assignee: SCA Development Aktiebolag
    Inventors: Karl G. Bohlin, Borje I. Fredriksson, Kent A. B. Karlsson, Lars T. Nelvig