US 12,474,514 B2
Optical camouflage filters
Guanglei Du, Pittsford, NY (US); John A. Wheatley, Lake Elmo, MN (US); Yi Hang Lv, Shanghai (CN); Anthony M. Renstrom, Forest Lake, MN (US); Neeraj Sharma, Lake Elmo, MN (US); and Fuguo Xu, Shanghai (CN)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed on Jan. 25, 2022, as Appl. No. 17/583,553.
Application 17/583,553 is a continuation of application No. 16/071,544, granted, now 11,269,121, previously published as PCT/CN2016/081271, filed on May 6, 2016.
Claims priority of provisional application 62/281,643, filed on Jan. 21, 2016.
Prior Publication US 2022/0146725 A1, May 12, 2022
Int. Cl. G02B 5/26 (2006.01); G02B 5/20 (2006.01); G02B 5/22 (2006.01); G02B 5/28 (2006.01)
CPC G02B 5/26 (2013.01) [G02B 5/206 (2013.01); G02B 5/208 (2013.01); G02B 5/22 (2013.01); G02B 5/223 (2013.01); G02B 5/281 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An article comprising an optical filter, the optical filter configured to provide near-infrared transmission such that a near-infrared pattern can be sensed through the optical filter, wherein the optical filter comprises:
a wavelength selective scattering layer, wherein the wavelength selective scattering layer has an average visible scattering of greater than 10%,
a wavelength selective reflective layer, and
at least one wavelength selective absorbing layer, wherein each wavelength selective layer is configured to transmit near-infrared wavelengths,
wherein the optical filter has a visible transmittance of less than 5% and a near-infrared transmittance of greater than 75% for wavelengths greater than 900 nm.