Patents by Inventor John B. Letts

John B. Letts 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: 12291620
    Abstract: A construction board comprising (i) a foam body having a generally planar shape with first and second planar surfaces, where said foam body is a closed-cell foam body including pentane and a blowing agent additive that has a Hansen Solubility Parameter that is greater than 17 MPa?0.5 contained within the foam body; and (ii) first and second facers attached to said first and second planar surfaces, respectively.
    Type: Grant
    Filed: December 10, 2020
    Date of Patent: May 6, 2025
    Assignee: Holcim Technology Ltd
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Patent number: 12263622
    Abstract: A process for producing a polyurethane or polyisocyanurate construction board, the process comprising (i) providing an A-side reactant stream that includes an isocyanate-containing compound; (ii) providing a B-side reactant stream that includes a polyol, where the B-side reactant stream includes a fluorinated additive and a blowing agent that includes a pentane and a blowing agent additive that has a Hansen Solubility Parameter (St) that is greater than 17 MPa?0.5; and (iii) mixing the A-side reactant stream with the B-side reactant stream to produce a reaction mixture.
    Type: Grant
    Filed: January 4, 2022
    Date of Patent: April 1, 2025
    Assignee: Holcim Technology Ltd
    Inventors: John B. Letts, Chunhua Yao
  • Patent number: 12006414
    Abstract: A process for producing a polyurethane or polyisocyanurate construction board, the process comprising of providing an A-side reactant stream that includes an isocyanate-containing compound; providing a B-side reactant stream that includes a polyol, where the B-side reactant steam includes a blowing agent mixture including isopentane and a blowing agent additive that has a Hansen Solubility Parameter (?t) that is greater than 15 MPa0.5; and mixing the A-side reactant stream with the B-side reactant stream to produce a reaction mixture.
    Type: Grant
    Filed: November 8, 2021
    Date of Patent: June 11, 2024
    Assignee: Holcim Technology Ltd
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Patent number: 11913222
    Abstract: A construction board includes a foam body having first and second planar surfaces, said foam body including a polyisocyanurate foam matrix defining a plurality of closed cells, said closed cells being at least substantially devoid of hydrocarbon blowing agents, and said foam body being characterized by a density, pursuant to ASTM C303, of at least 2.5 lbs/ft3; and a facer disposed on a planar surface of said foam body, said facer including a glass substrate having an internal planar surface proximate to said foam body and an external planar surface opposite said foam body, a first coating disposed on said external surface, and a second coating disposed on or proximate to said internal surface, where said first coating disposed on said external surface includes an inert filler, and where said second coating disposed on or proximate to said internal surface includes intumescent material.
    Type: Grant
    Filed: February 3, 2022
    Date of Patent: February 27, 2024
    Assignee: Holcim Technology Ltd
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Patent number: 11618235
    Abstract: A composite board comprising (i) a first foam region; (ii) at least one fragile insulating material; and (iii) a second foam region, where said second foam region is substantially devoid of hydrocarbons.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: April 4, 2023
    Assignee: Holcim Technology Ltd
    Inventors: Michael J. Hubbard, Chunhua Yao, John B. Letts
  • Publication number: 20220251320
    Abstract: A process for producing a polyurethane or polyisocyanurate construction board, the process comprising (i) providing an A-side reactant stream that includes an isocyanate-containing compound; (ii) providing a B-side reactant stream that includes a polyol and a physical blowing agent, where the physical blowing agent includes pentane, butane, and optionally a blowing agent additive that has a Hansen Solubility Parameter (?t) that is greater than 17 MPa?0.5; and (iii) mixing the A-side reactant stream with the B-side reactant stream to produce a reaction mixture.
    Type: Application
    Filed: April 25, 2022
    Publication date: August 11, 2022
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Patent number: 11242681
    Abstract: A construction board includes a foam body having first and second planar surfaces, said foam body including a polyisocyanurate foam matrix defining a plurality of closed cells, said closed cells being at least substantially devoid of hydrocarbon blowing agents, and said foam body being characterized by a density, pursuant to ASTM C303, of at least 2.5 lbs/ft3; and a facer disposed on a planar surface of said foam body, said facer including a glass substrate having an internal planar surface proximate to said foam body and an external planar surface opposite said foam body, a first coating disposed on said external surface, and a second coating disposed on or proximate to said internal surface, where said first coating disposed on said external surface includes an inert filler, and where said second coating disposed on or proximate to said internal surface includes intumescent material.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: February 8, 2022
    Assignee: Firestone Building Products Company, LLC
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Publication number: 20210198527
    Abstract: A method of constructing a roof assembly, the method comprising (i) mechanically affixing a construction board to a roof deck; (ii) providing a composite insulation board including (a) at least one vacuum-insulated capsule; (b) a foam body that encases said at least one vacuum-insulated capsule, said foam body having first and second opposed planar surfaces; (c) a layer of pressure-sensitive adhesive disposed, either directly or indirectly, on one of said first and second opposed planar surfaces; and (d) a release liner removably attached to the layer of pressure-sensitive adhesive; (iii) removing the release liner from the composite insulation board; (iv) mating the composite insulation board to the construction board that is mechanically affixed to the roof deck; and (v) installing a membrane system over the composite insulation board.
    Type: Application
    Filed: March 16, 2021
    Publication date: July 1, 2021
    Inventors: Michael J. Hubbard, John B. Letts, Chunhua Yao
  • Patent number: 10870987
    Abstract: A construction board comprising (i) a foam body having a generally planar shape with first and second planar surfaces, where said foam body is a closed-cell foam body including pentane and a blowing agent additive that has a Hansen Solubility Parameter that is greater than 17 MPa?0.5 contained within the foam body; and (ii) first and second facers attached to said first and second planar surfaces, respectively.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: December 22, 2020
    Assignee: Firestone Building Products Company, LLC
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Patent number: 10611066
    Abstract: Embodiments of the present invention are based, at least in part, on the discovery of methods for encapsulating fragile insulation materials within polyisocyanurate foam to thereby provide a construction board having an advantageous balance of insulating properties and mechanical durability.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: April 7, 2020
    Assignee: Firestone Building Products Co., LLC
    Inventors: John B. Letts, Michael J. Hubbard
  • Publication number: 20200055275
    Abstract: A construction board comprising (i) a foam layer; (ii) a facer substrate; and (iii) a fire-resistant interfacial layer disposed between said facer substrate and said foam layer.
    Type: Application
    Filed: May 7, 2018
    Publication date: February 20, 2020
    Inventors: Chunhua Yao, Michael J. Hubbard, John B. Letts
  • Publication number: 20200017654
    Abstract: A process for producing a polyurethane or polyisocyanurate construction board, the process comprising (i) providing an A-side reactant stream that includes an isocyanate containing compound; (ii) providing a B-side reactant stream that includes a polyol and a physical blowing agent, where the physical blowing agent includes pentane, butane, and optionally a blowing agent additive that has a Hansen Solubility Parameter (?t) that is greater than 17 MPa?0.5; and (iii) mixing the A-side reactant stream with the B-side reactant stream to produce a reaction mixture.
    Type: Application
    Filed: March 19, 2018
    Publication date: January 16, 2020
    Applicant: Firestone Building Products Company, LLC
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Publication number: 20190225766
    Abstract: A process for producing a polyurethane or polyisocyanurate construction board, the process comprising: providing an A-side reactant stream that includes an isocyanate-containing compound; providing a B-side reactant stream that includes a polyol, wherein the B-side reactant stream includes a blowing agent mixture including isopentane and a blowing agent additive that has a Hansen Solubility Parameter (?t) that is greater than 15 MPa0.5; and mixing the A-side reactant stream with the B-side reactant stream to produce a reaction mixture.
    Type: Application
    Filed: August 21, 2017
    Publication date: July 25, 2019
    Inventors: John B. Letts, Chunhua Yao, Michael J. Hubbard
  • Publication number: 20190186124
    Abstract: A composite insulation board comprising of a vacuum-insulated capsule; a foam body that encases said capsule, said foam body having first and second opposed planar surfaces; and a layer of pressure-sensitive adhesive disposed, either directly or indirectly, on one of said first and second opposed planar surfaces.
    Type: Application
    Filed: May 15, 2017
    Publication date: June 20, 2019
    Inventors: Michael J. Hubbard, John B. Letts, Chunhua Yao
  • Patent number: 9856651
    Abstract: A roofing system includes a construction board positioned over a roof deck and a plurality of fastening plates positioned on a top surface of the construction board. At least one connector extends between two of the plurality of fastening plates and is positioned on the top surface of the construction board. The construction boards may be insulation or cover boards, and in certain embodiments may be polyisocyanurate boards. Fasteners are driven through the fastening plates and the construction boards and into an underlying roof deck to secure the construction boards in place.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: January 2, 2018
    Assignee: Firestone Building Products Co., LLC
    Inventors: John B. Letts, Timothy Tackett, Allen Sopko, Michael Hubbard, John Geary
  • Publication number: 20160369510
    Abstract: A covered roof includes a roof deck, an insulation board, and a coverboard. The insulation board includes a polyurethane, a polyisocyanurate, or a mix of polyurethane and polyisocyanurate cellular structure, has a density that is less than 2.5 pounds per cubic foot, and has a first planar surface and a second planar surface, each having a facer positioned adjacent thereto. The coverboard includes a polyurethane, a polyisocyanurate, or a mix of polyurethane and polyisocyanurate cellular structure, has a density greater than about 2.5 pounds per cubic foot and less than 6 pounds per cubic foot, an iso index of at least 175, and a first planar surface and a second planar surface, each having a facer positioned adjacent thereto.
    Type: Application
    Filed: September 1, 2016
    Publication date: December 22, 2016
    Applicant: FIRESTONE BUILDING PRODUCTS CO., LLC
    Inventors: Gregory A. Brandt, John B. Letts
  • Publication number: 20160168853
    Abstract: A construction board comprising of a foam body, said foam body having first and second planar sides; and a facer affixed to said first or second planar surface, said facer including a cellulosic substrate and a water-resistant coating layer, said cellulosic layer having first and second planar sides, where said first planar side of said cellulosic substrate is affixed to said foam body and said second planar side carries said coating, where said cellulosic substrate is substantially devoid of fiberglass, where said water-resistant coating layer has a thickness of less than 1.5 mm, and where said water-resistant coating layer includes a polymeric binder and a filler dispersed throughout the binder.
    Type: Application
    Filed: December 11, 2015
    Publication date: June 16, 2016
    Inventors: John B. Letts, Michael Vall, Timothy L. Bergwall
  • Publication number: 20130164524
    Abstract: A construction board comprising a foam layer and at least one coated facer, where the at least one coated facer includes a substrate and a coating.
    Type: Application
    Filed: April 14, 2011
    Publication date: June 27, 2013
    Inventors: John B. Letts, Michael Vall, Timothy L. Bergwall
  • Publication number: 20120167509
    Abstract: A covered roof includes a roof deck, an insulation board, and a coverboard. The insulation board includes a polyurethane, a polyisocyanurate, or a mix of polyurethane and polyisocyanurate cellular structure, has a density that is less than 2.5 pounds per cubic foot, and has a first planar surface and a second planar surface, each having a facer positioned adjacent thereto. The coverboard includes a polyurethane, a polyisocyanurate, or a mix of polyurethane and polyisocyanurate cellular structure, has a density greater than about 2.5 pounds per cubic foot and less than 6 pounds per cubic foot, an iso index of at least 175, and a first planar surface and a second planar surface, each having a facer positioned adjacent thereto.
    Type: Application
    Filed: March 7, 2012
    Publication date: July 5, 2012
    Inventors: Gregory A. BRANDT, John B. Letts
  • Publication number: 20120167510
    Abstract: A high density construction board includes a cellular body having a first planar surface and a second planar surface. A first glass facer is positioned adjacent the first planar surface and a second glass facer is positioned adjacent the second planar surface. The cellular body of the construction board includes a polyurethane, a polyisocyanurate, or a mix of polyurethane and polyisocyanurate and has a density greater than about 2.5 pounds per cubic foot and less than 6 pounds per cubic foot.
    Type: Application
    Filed: March 12, 2012
    Publication date: July 5, 2012
    Inventors: Gregory A. Brandt, John B. Letts