US 11,940,679 B2
Optical filter with light source
Neil Robin Branda, North Vancouver (CA); Jeremy Graham Finden, North Vancouver (CA); Duhane Lam, Burnaby (CA); Jonathan Ross Sargent, Vancouver (CA); Cynthia Elizabeth Shippam, Burnaby (CA); and Douglas Malcolm Wiggin, Burnaby (CA)
Assigned to Solutia Canada Inc., British Columbia (CA)
Filed by SOLUTIA CANADA INC., Vancouver (CA)
Filed on Nov. 8, 2022, as Appl. No. 17/983,299.
Application 17/983,299 is a continuation of application No. 16/874,302, filed on May 14, 2020, granted, now 11,586,060.
Application 16/874,302 is a continuation of application No. 16/388,348, filed on Apr. 18, 2019, granted, now 10,663,771, issued on May 26, 2020.
Application 16/388,348 is a continuation of application No. 15/875,863, filed on Jan. 19, 2018, granted, now 10,310,300, issued on Jun. 4, 2019.
Application 15/875,863 is a continuation of application No. 14/380,607, granted, now 9,910,301, issued on Mar. 6, 2018, previously published as PCT/CA2013/000176, filed on Feb. 22, 2013.
Claims priority of provisional application 61/602,203, filed on Feb. 23, 2012.
Prior Publication US 2023/0096611 A1, Mar. 30, 2023
Int. Cl. G02F 1/03 (2006.01); G02B 5/23 (2006.01); G02B 26/02 (2006.01); G02C 7/10 (2006.01); G02F 1/01 (2006.01); G02F 1/07 (2006.01); G02F 1/1516 (2019.01); G02F 1/15 (2019.01)
CPC G02F 1/03 (2013.01) [G02B 5/23 (2013.01); G02B 26/02 (2013.01); G02C 7/102 (2013.01); G02F 1/0126 (2013.01); G02F 1/0147 (2013.01); G02F 1/1516 (2019.01); G02C 7/101 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a. a switchable optical filter comprising:
i. a layer of switchable material, the switchable material comprising a photochromic compound configured to cause the switchable material to transition from a first state to a second state in response to light of a wavelength within a first range of wavelengths, and from the second state to the first state in response to light of a wavelength within a second range of wavelengths, and
ii. a substrate;
b. a first light source providing light of a wavelength that causes the switchable material to transition from a faded state to a dark state, or a dark state to a faded state; and
c. a switch for controlling activation of the first light source.