Patents by Inventor Stefan Mellander

Stefan Mellander 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: 12005418
    Abstract: A reactor vessel (1) for biomass material, wherein said reactor vessel (1) is a pressurized reactor vessel, said reactor vessel being elongated and comprising: a substantially tubular vessel part (3); two gables (5a, 5b) connected one to each end (19a, 19b) of the tubular vessel part (3), hereby enclosing a vessel internal compartment (7); and a material transporting screw (8) comprising a central shaft (9) provided within the vessel internal compartment (7) extending between the two gables (5a, 5b) along a central axis (A) of the reactor vessel (1), wherein said material transporting screw further comprises screw flight (11) provided around the shaft (9), wherein said material transporting screw is configured for transporting the biomass material through the reactor vessel, wherein both gables (5a, 5b) are inwardly dished.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: June 11, 2024
    Assignee: VALMET AB
    Inventors: Stefan Mellander, Johan Carlsson, Lars Fredriksson, Francois Lambert
  • Patent number: 10227728
    Abstract: A dewatering roll (10) comprises a roll body (20), a mantle support structure (30) and a mantle (40). The mantle support structure (30) is attached around the roll body (20). The mantle (40) is attached against an outer surface (36) of the mantle support structure (30). The mantle (40) has a plurality of through holes (42) constituting mantle flow paths (44). The mantle support structure (30) presents support flow paths (38) from the outer surface (36) of the mantle support structure (30). The support flow paths (38) are in fluid contact with the mantle flow paths (44). The outer surface (36) of the mantle support structure (30) has a static geometric shape defining an envelope having a smaller radius in vicinity of each axial end (15) than in vicinity of a center (16). Thereby, the inner surface (48) of the mantle (44) assumes the shape of the envelope.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: March 12, 2019
    Assignee: Valmet AB
    Inventors: Stefan Mellander, Peter Svedberg
  • Publication number: 20170089009
    Abstract: A feeding arrangement for feeding comminuted material to a treatment stage using a plug screw feeder. The invention relates to a design of the inlet to the plug screw feeder wherein, at least 2 chutes (20a,20b) are arranged to feed material to the feed screw (10), and that the cross section of each chute is arranged such that more than 50% of the outlet cross section of a first chute (20a) is located on one side of the feed screw axis (CC) and more than 50% of the outlet cross section of a second chute (20b) is located on the other side of the feed screw axis. In an upgrade version for existing plug screw feeders with large rectangular inlets is an insert body (11a) used filling the rectangular inlet, besides the chutes (20a, 20b) passing through the insert body (11a).
    Type: Application
    Filed: May 19, 2015
    Publication date: March 30, 2017
    Applicant: Valmet AB
    Inventors: Stefan Mellander, Peter Svedberg
  • Publication number: 20160305067
    Abstract: A dewatering roll (10) comprises a roll body (20), a mantle support structure (30) and a mantle (40). The mantle support structure (30) is attached around the roll body (20). The mantle (40) is attached against an outer surface (36) of the mantle support structure (30). The mantle (40) has a plurality of through holes (42) constituting mantle flow paths (44). The mantle support structure (30) presents support flow paths (38) from the outer surface (36) of the mantle support structure (30). The support flow paths (38) are in fluid contact with the mantle flow paths (44). The outer surface (36) of the mantle support structure (30) has a static geometric shape defining an envelope having a smaller radius in vicinity of each axial end (15) than in vicinity of a centre (16). Thereby, the inner surface (48) of the mantle (44) assumes the shape of the envelope.
    Type: Application
    Filed: December 15, 2014
    Publication date: October 20, 2016
    Applicant: Valmet AB
    Inventors: Stefan Mellander, Peter Svedberg
  • Patent number: 9434551
    Abstract: A screw conveyor for transporting lignocellulose-containing material, including a housing containing a screw for transporting the lignocellulose-containing material from the inlet to the outlet of the housing, the screw including a screw core disposed along the screw axis and a screw thread surrounding the screw core, the screw thread including a screw depth defined by the distance between the periphery of the screw and the screw core, the inlet including at least one transverse plate dividing the inlet into at least two axial compartments for evenly distributing the lignocellulose-containing material at the inlet. A method for transporting lignocellulose-containing material by the screw conveyor, in which the axial length of the screw inlet being equal to or greater than the screw depth times the quotient between the axial speed of the screw and the incoming speed of the lignocellulose-containing material at the inlet.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: September 6, 2016
    Assignee: Valmet AB
    Inventors: Stefan Mellander, Peter Svedberg
  • Publication number: 20150375942
    Abstract: A screw conveyor for transporting lignocellulose-containing material is disclosed, including a housing containing a screw for transporting the lignocellulose-containing material from the inlet to the outlet of the housing, the screw including a screw core disposed along the screw axis and a screw thread surrounding the screw core, the screw thread including a screw depth defined by the distance between the periphery of the screw and the screw core, the inlet including at least one transverse plate dividing the inlet into at least two axial compartments for evenly distributing the lignocellulose-containing material at the inlet. A method for transporting lignocellulose-containing material by the screw conveyor is also disclosed, in which the axial length of the screw inlet being equal to or greater than the screw depth times the quotient between the axial speed of the screw and the incoming speed of the lignocellulose-containing material at the inlet.
    Type: Application
    Filed: February 19, 2014
    Publication date: December 31, 2015
    Applicant: VALMET AB
    Inventors: Stefan Mellander, Peter Svedberg