US 12,380,306 B2
Method of detecting a concealed pattern
Nicolas B. Duarte, Allison Park, PA (US); Zachary J. Brown, Austin, TX (US); Juan F. Choreno, Zumpango (MX); Julian M. Galvan-Miyoshi, Texcoco (MX); Darin W. Laird, Pittsburgh, PA (US); Alejandro Morones Dobarganes, Tepexpan (MX); Jose Alberto Olivares Lecona, Mexico City (MX); Stuart D. Hellring, Pittsburgh, PA (US); and Michael A. Zalich, Wexford, PA (US)
Assigned to PPG Industries Ohio, Inc., Cleveland, OH (US)
Filed by PPG INDUSTRIES OHIO, INC., Cleveland, OH (US)
Filed on Jul. 12, 2024, as Appl. No. 18/771,446.
Application 18/771,446 is a continuation of application No. 18/361,725, filed on Jul. 28, 2023, granted, now 12,050,950.
Application 18/361,725 is a continuation of application No. 17/879,279, filed on Aug. 2, 2022, granted, now 11,809,933, issued on Nov. 7, 2023.
Application 17/879,279 is a continuation of application No. 17/293,813, granted, now 11,461,607, issued on Oct. 4, 2022, previously published as PCT/US2019/060897, filed on Nov. 12, 2019.
Claims priority of provisional application 62/760,371, filed on Nov. 13, 2018.
Prior Publication US 2024/0370683 A1, Nov. 7, 2024
Int. Cl. G06K 19/06 (2006.01); B05D 5/06 (2006.01); B05D 7/00 (2006.01); G06K 7/12 (2006.01)
CPC G06K 19/0614 (2013.01) [B05D 5/06 (2013.01); B05D 7/52 (2013.01); G06K 7/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A coating system configured to enable detection of a concealed pattern, comprising:
a first coating layer comprising a pattern disposed over at least a portion of the substrate, wherein the first coating layer forms the pattern in a shape of a machine-readable image, barcode, or QR code using a plurality of regions using a combination of near-IR absorptive and near-IR emissive material; and
a second coating layer applied over the first coating layer, the second coating layer comprising a visibly opaque layer that is substantially free of TiO2, the visibly opaque layer being near-IR transparent, the visibly opaque layer comprising an infrared transparent pigment disposed over the pattern,
wherein the emissivity and/or absorbance of infrared electromagnetic radiation by the pattern at a wavelength in the range of 700 to 1100 nm differs from the emissivity and/or absorbance by the contrasting regions of the pattern of the first coating layer at the wavelength using regions of near-IR absorptive and near-IR emissive material;
wherein the visibly opaque layer is substantially free of an infrared absorbing pigment and/or an infrared emissive pigment, such that the combination of near-IR absorptive and near-IR emissive material beneath the second coating layer is detectable through the second coating layer at the wavelength;
wherein the near-IR emissive material comprises an infrared fluorescent pigment.