Patents by Inventor Nils Leffler

Nils Leffler 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 for maximizing the reduction efficiency of a recovery boiler
    Patent number: 4359950
    Abstract: In a recovery boiler having a plurality of air inputs, with the primary air input closest to the bed of the boiler, a fuel input, a smelt output, and an exhaust output, a method of controlling the combustion of fuel in the boiler to operate at the maximum reduction efficiency. The method includes the steps of measuring the amount of sulphur dioxide at the exhaust output; and varying the amount of air entering into the boiler through the primary air input until the minimum amount of sulphur dioxide is measured at the exhaust output.
    Type: Grant
    Filed: October 3, 1980
    Date of Patent: November 23, 1982
    Assignee: Measurex Corporation
    Inventors: Nils Leffler, Kalevi Kaski
  • Method of controlling basis weight of a cylinder board machine
    Patent number: 4053353
    Abstract: A method for the control of basis weight of a sheet material made from liquid stock controls the consistency of liquid stock flowing to a flow box by a consistency feedback loop, and varies the level of liquid stock in the flow box to effect a change in the flow of dry fiber to the sheet former. Level is maintained in a midrange and any level called for outside of midrange is handled by adjusting consistency.
    Type: Grant
    Filed: January 13, 1976
    Date of Patent: October 11, 1977
    Assignee: Measurex Corporation
    Inventor: Nils Leffler