Patents by Inventor Per-Anders Ottosson

Per-Anders Ottosson 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).

  • Profile bar screen for digester vessels
    Patent number: 10087579
    Abstract: The invention relates to an improved profile bar screen for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel. According to the invention is a profile bar screen designed with horizontal support arches 11 with integrated support shoulders 12 only at the outer ends of the support arch which support shoulders rest against the inside of the vessel wall 1. The invention combines the techniques from self-supporting screens with support members of weaker screen designs, avoiding need to make any additional welds in the classified pressure vessel wall of the digester. Installation of new screens in compartments previously equipped with blind plates in checkered screen rows may be done quickly and at less costs during shorter down time of digester.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: October 2, 2018
    Assignee: Valmet AB
    Inventors: Per-Anders Ottosson, Jerk Söderman
  • PROFILE BAR SCREEN FOR DIGESTER VESSELS
    Publication number: 20170284022
    Abstract: The invention relates to an improved profile bar screen for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel. According to the invention is a profile bar screen designed with horizontal support arches 11 with integrated support shoulders 12 only at the outer ends of the support arch which support shoulders rest against the inside of the vessel wall 1. The invention combines the techniques from self-supporting screens with support members of weaker screen designs, avoiding need to make any additional welds in the classified pressure vessel wall of the digester. Installation of new screens in compartments previously equipped with blind plates in checkered screen rows may be done quickly and at less costs during shorter down time of digester.
    Type: Application
    Filed: August 27, 2015
    Publication date: October 5, 2017
    Applicant: Valmet AB
    Inventors: Per-Anders Ottosson, Jerk Söderman