Patents by Inventor Per Holgerson

Per Holgerson 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: 11723319
    Abstract: A greenhouse screen strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product, wherein at least some of the strips comprise a film material in the form of a single- or multilayer polyester film is disclosed. The film material has a transparency of at least 93.5% and is provided with at least a first anti-reflective coating or layer on a first side of the film material.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: August 15, 2023
    Assignee: AB LUDVIG SVENSSON
    Inventors: Per Holgerson, Daniel Asplund
  • Patent number: 11395463
    Abstract: A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product is disclosed. At least some of the strips comprise a film material in the form of a single- or multilayer polyester film wherein the film contains at least 1.0 wt.-% SiO2 and a maximum of 2.5 wt.-% SiO2, and has a spreading factor of at least 2 and not more than 8. The greenhouse screen as disclosed herein has a reduced flammability and light scattering properties particularly suited for greenhouse applications.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: July 26, 2022
    Assignee: AB Ludvig Svensson
    Inventors: Per Holgerson, Daniel Asplund
  • Publication number: 20210259162
    Abstract: A greenhouse screen is described with strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product is disclosed. At least some of the strips include a film material in the form of a single- or multilayer polyethylene film having a thickness of 10-70 micrometers. Said film has at least 2-4 wt.-% SiO2 particles having a D50 of 2-10 micrometers. The film is advantageously used as a screen providing light scattering properties particularly suited for greenhouse applications.
    Type: Application
    Filed: July 16, 2018
    Publication date: August 26, 2021
    Inventors: Per Holgerson, Sara Widén
  • Publication number: 20200315102
    Abstract: A greenhouse screen strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product, wherein at least some of the strips comprise a film material in the form of a single- or multilayer polyester film is disclosed. The film material has a transparency of at least 93.5% and is provided with at least a first anti-reflective coating or layer on a first side of the film material.
    Type: Application
    Filed: May 30, 2017
    Publication date: October 8, 2020
    Inventors: Per Holgerson, Daniel Asplund
  • Publication number: 20200205353
    Abstract: A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of a knitting, warp-knitting or weaving process to form a continuous product is provided. At least some of the strips comprise a polyester film having a transparency of at least 93%, said polyester film having at least one base layer B comprising a thermoplastic polyester and a UV stabilizer. The polyester film has a first and a second surface, wherein a permanent anti-fog coating is applied to at least one of the first or second surfaces of the polyester film. The anti-fog coating has a lower refractive index than the base layer B.A process for producing said film is also disclosed.
    Type: Application
    Filed: September 13, 2018
    Publication date: July 2, 2020
    Inventors: Per HOLGERSON, Daniel ASPLUND
  • Publication number: 20200163284
    Abstract: A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product is disclosed. At least some of the strips comprise a film material in the form of a single- or multilayer polyester film wherein the film contains at least 1.0 wt.-% SiO2 and a maximum of 2.5 wt.-% SiO2, and has a spreading factor of at least 2 and not more than 8. The greenhouse screen as disclosed herein has a reduced flammability and light scattering properties particularly suited for greenhouse applications.
    Type: Application
    Filed: January 20, 2017
    Publication date: May 28, 2020
    Inventors: Per HOLGERSON, Daniel ASPLUND
  • Patent number: 9167754
    Abstract: The invention refers to a greenhouse screen comprising strips of film material that are interconnected by a yarn framework of transverse threads and longitudinal threads to form a continuous product, wherein the yarn framework is thermally bonded to at least one side of the strips of film material, wherein also those parts of the yarn framework that is thermally bonded to the strips have liquid-transporting capacity by capillary action. The amount of yarn in the yarn framework interconnecting and holding the strips can herewith be reduced.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: October 27, 2015
    Assignee: AB Ludvig Svensson
    Inventors: Hans Andersson, Per Holgerson
  • Patent number: 9003698
    Abstract: The invention refers to a greenhouse screen comprising strips of film material that are interconnected by a yarn system by means of hosiery, knitting, warp-knitting or weaving process to form a continuous product. At least some of the strips comprise a film material in the form of a multilayer polyester film having a thickness less than 60 ?m and comprising at least two layers, wherein at least one layer is white and at least one layer is black, the at least one white layer comprises polyester and a white pigment in an amount between 5 and 50 weight-% based on the total weight of the white layer, and the at least one black layer comprises polyester and a black opacifying agent.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: April 14, 2015
    Assignee: AB Ludvig Svensson
    Inventors: Hans Andersson, Per Holgerson
  • Publication number: 20150059239
    Abstract: The invention refers to a greenhouse screen comprising strips of film material that are interconnected by a yarn framework of transverse threads and longitudinal threads to form a continuous product, wherein the yarn framework is thermally bonded to at least one side of the strips of film material, wherein also those parts of the yarn framework that is thermally bonded to the strips have liquid-transporting capacity by capillary action. The amount of yarn in the yarn framework interconnecting and holding the strips can herewith be reduced.
    Type: Application
    Filed: September 18, 2012
    Publication date: March 5, 2015
    Inventors: Hans Andersson, Per Holgerson
  • Publication number: 20130008082
    Abstract: The invention refers to a greenhouse screen comprising strips of film material that are interconnected by a yarn system by means of hosiery, knitting, warp-knitting or weaving process to form a continuous product. At least some of the strips comprise a film material in the form of a multilayer polyester film having a thickness less than 60 ?m and comprising at least two layers, wherein at least one layer is white and at least one layer is black, said at least one white layer comprises polyester and a white pigment in an amount between 5 and 50 weight-% based on the total weight of said white layer, and said at least one black layer comprises polyester and a black opacifying agent.
    Type: Application
    Filed: February 4, 2011
    Publication date: January 10, 2013
    Applicant: AB LUDVIG SVENSSON
    Inventors: Hans Andersson, Per Holgerson