US 12,216,298 B2
Optical camouflage filters
John A. Wheatley, Lake Elmo, MN (US); Guanglei Du, Woodbury, MN (US); David T. Yust, Woodbury, MN (US); Neeraj Sharma, Woodbury, MN (US); Gilles J. Benoit, Minneapolis, MN (US); Ellison G. Kawakami, St. Paul, MN (US); and Anthony M. Renstrom, Forest Lake, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed on May 10, 2021, as Appl. No. 17/302,662.
Application 17/302,662 is a division of application No. 16/071,720, granted, now 11,054,556, previously published as PCT/US2017/014416, filed on Jan. 20, 2017.
Claims priority of provisional application 62/349,944, filed on Jun. 14, 2016.
Claims priority of provisional application 62/281,643, filed on Jan. 21, 2016.
Prior Publication US 2021/0263203 A1, Aug. 26, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 5/20 (2006.01); G02B 5/28 (2006.01); G02B 5/30 (2006.01)
CPC G02B 5/208 (2013.01) [G02B 5/285 (2013.01); G02B 5/28 (2013.01); G02B 5/3025 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A printed article having an average transmittance of less than 0.1% for wavelengths between 400 nm and 700 nm and average transmittance of greater than 50% for wavelengths between 830 nm and 900 nm, the printed article comprising:
a wavelength selective reflective layer comprising an interference filter having an average transmittance of greater than 50% for wavelengths between 830 nm and 900 nm and a transmittance of greater than 70% for wavelengths between 950 nm and 1250 nm, a transmission spectrum of the reflective layer comprising at least one peak between 400 nm and 700 nm; and
at least one printed wavelength selective absorbing layer having an average visible transmittance for wavelengths between 400 nm and 700 nm of less than about 30%.