Patents by Inventor David Lindkvist

David Lindkvist 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: 9410286
    Abstract: Screening apparatus for screening pulp suspensions are provided. The screening apparatus includes a casing, a cylindrical screen member is arranged on the casing for dividing the pulp into accept and reject portions, an inlet for the pulp, an outlet for the accept, an outlet for the reject, a rotor with a rotor body, and at least one pulsator located on the inside of the screen, so that a screening chamber is formed between the rotor and the screen. The rotor is provided with a detachable pulsator package including at least one attachment ring attached to the rotor body, at least one support ring attached to or supported by the rotor body and the at least one pulsator attached to the at least one attachment ring and the at least one support ring.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: August 9, 2016
    Assignee: Valnet AB
    Inventors: Anders Bergdahl, David Lindkvist
  • Publication number: 20150345077
    Abstract: Screening apparatus for screening pulp suspensions are provided. The screening apparatus includes a casing, a cylindrical screen member is arranged on the casing for dividing the pulp into accept and reject portions, an inlet for the pulp, an outlet for the accept, an outlet for the reject, a rotor with a rotor body, and at least one pulsator located on the inside of the screen, so that a screening chamber is formed between the rotor and the screen. The rotor is provided with a detachable pulsator package including at least one attachment ring attached to the rotor body, at least one support ring attached to or supported by the rotor body and the at least one pulsator attached to the at least one attachment ring and the at least one support ring.
    Type: Application
    Filed: November 27, 2013
    Publication date: December 3, 2015
    Applicant: VALMET AB
    Inventors: Anders Bergdahl, David Lindkvist
  • Patent number: 8303769
    Abstract: Apparatus for screening cellulose pulp streams is disclosed including first and second screens contained in a housing, and a primary inlet for directing the cellulose pulp stream into the housing, an accept outlet for withdrawing an accept portion from the housing, a reject outlet for withdrawing a reject portion from the housing, a first accept chamber for receiving the accept portion which has passed through the first screen, a second screen chamber for directing the first accept portion to the second screen, and a secondary pulp inlet for receiving a second cellulose pulp feed stream comprising a screened cellulose pulp accept fraction and directing it to the second screen whereby the second accept fraction is delivered to the accept outlet. Methods and systems for screening cellulose pulp systems are also disclosed.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: November 6, 2012
    Assignee: Metso Paper, Inc.
    Inventors: Andreas Engelfeldt, Bertil Ernerfeldt, David Lindkvist
  • Publication number: 20120000619
    Abstract: Apparatus for screening cellulose pulp streams is disclosed including first and second screens contained in a housing, and a primary inlet for directing the cellulose pulp stream into the housing, an accept outlet for withdrawing an accept portion from the housing, a reject outlet for withdrawing a reject portion from the housing, a first accept chamber for receiving the accept portion which has passed through the first screen, a second screen chamber for directing the first accept portion to the second screen, and a secondary pulp inlet for receiving a second cellulose pulp feed stream comprising a screened cellulose pulp accept fraction and directing it to the second screen whereby the second accept fraction is delivered to the accept outlet. Methods and systems for screening cellulose pulp systems are also disclosed.
    Type: Application
    Filed: March 9, 2010
    Publication date: January 5, 2012
    Applicant: METSO PAPER, INC.
    Inventors: Andreas Engelfeldt, Bertil Ernerfeldt, David Lindkvist
  • Publication number: 20110233130
    Abstract: The invention relates to a method and an arrangement for fixing an endless wire (2) to a cylindrical drum (1). The endless wire (2) is shrunk around the whole circumference of the cylindrical drum (1), such that the edge portions (3) of the endless wire (2) are located near the edge sections (4) of the cylindrical drum. The shrunk endless wire (2) has a length that makes it fit tightly around said drum (1). At least two strips (5) of a shrinkable material have been shrunk around the edge portions (3) of the endless wire (2) that is arranged on the cylindrical drum (1), such that they form endless strips (5) for holding the edge portions (3) of the endless wire (2) fixed around the whole circumference of the cylindrical drum (1). The shrunk strips (5) also have a length that make them fit tightly around said drum and such that they assist in keeping the edge portions (3) of the endless wire (2) fixed around the cylindrical drum (1).
    Type: Application
    Filed: December 9, 2009
    Publication date: September 29, 2011
    Applicant: METSO PAPER, INC.
    Inventor: David Lindkvist