US 12,392,141 B2
Floor board and method for manufacturing such floor boards
Dieter D'Hondt, Sint-andries (BE); and Aaron Shaw, High Point, NC (US)
Assigned to UNILIN, BV, Wielsbeke (BE)
Filed by FLOORING INDUSTRIES LIMITED, SARL, Bertrange (LU)
Filed on Jul. 6, 2023, as Appl. No. 18/348,056.
Application 18/348,056 is a continuation of application No. 17/374,431, filed on Jul. 13, 2021, granted, now 11,746,537.
Application 17/374,431 is a continuation of application No. 16/808,745, filed on Mar. 4, 2020, granted, now 11,473,315, issued on Oct. 18, 2020.
Application 16/808,745 is a continuation of application No. 15/571,576, granted, now 10,655,338, issued on May 19, 2020, previously published as PCT/US2016/031170, filed on May 6, 2016.
Claims priority of provisional application 62/160,283, filed on May 12, 2015.
Prior Publication US 2023/0349169 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 3/10 (2006.01); E04F 15/02 (2006.01); E04F 15/10 (2006.01)
CPC E04F 15/02038 (2013.01) [E04F 15/102 (2013.01); E04F 15/107 (2013.01); Y10T 428/24777 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A floor board comprising a substrate having side edges and a decorative surface layer applied to said substrate;
wherein the decorative surface layer is formed of paper layers and/or of veneer layers;
wherein the substrate comprises MDF or HDF material at a side edge thereof, wherein said side edge of said substrate is treated with an impregnation agent comprising at least an MDI (methylene diphenyl di-isocyanate) and a solvent different from water;
wherein the MDF or HDF material has an average density of more than 750 kg per cubic meter and comprises a higher density region extending at least near the decorative surface layer, wherein the higher density region has a density of 900 kilograms per cubic meter or more.