Patents by Inventor Per Nyström

Per Nyström 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).

  • Patent number: 6325889
    Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: December 4, 2001
    Assignee: Kvaerner Pulping AB
    Inventors: Vidar Snekkenes, Johan Engström, Sven-Erik Ohlsson, Per Nyström, Sören Söderqvist, Björn Karlsson
  • Patent number: 6241852
    Abstract: Process and device for mixing fluid into a pulp suspension of cellulose-containing fiber material, in which the pulp suspension is pumped in through a pump inlet (17), brought into rotation and, at the desired reaction pressure, mixed with the said fluid while passing through a reaction sector comprising a stator shell (1), a rotor (7) which is coaxial therewith, and at least one fluid inlet (23), after which the pulp mixture leaves the reaction sector through a pulp outlet (20), in which the fluid, via the said fluid inlet (23), is supplied in the vicinity of the center of rotation of the rotating pulp suspension, where the local pressure in the pulp suspension is lower, due to the centrifugal force increasing radially outwards, than the reaction pressure prevailing at the periphery of the pulp suspension.
    Type: Grant
    Filed: January 9, 1997
    Date of Patent: June 5, 2001
    Assignee: Kvaerner Pulping AB
    Inventors: Rolf Ekholm, Ulf Jansson, Per Nyström
  • Patent number: 6171494
    Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: January 9, 2001
    Assignee: Kvaener Pulping AB
    Inventors: Vidar Snekkenes, Johan Engström, Sven-Erik Ohlsson, Per Nyström, Sören Söderqvist, Björn Karlsson
  • Patent number: PP17085
    Abstract: A new and distinct cultivar of Buxus semperviresn, ‘Polar’, found in a province of Sweden where the climate is cold (representing zone 4 of the Swedish Hardiness Map) that exhibits exceptional winter hardiness. ‘Polar’ is further characterized by a dense, compact, and medium to broad growth habit and evergreen foliage with leaves that are broadly elliptic in shape, shiny in appearance, and dark green in color that exhibits no substantial change in coloration during the winter. ‘Polar’ is well suited for topiary and for use in parks and gardens in cold climates, where other Boxwood cultivars are inappropriate.
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: September 5, 2006
    Assignee: Sveplants E-grupp ekonomisk förening
    Inventor: Per Nyström