Invention Grant
- Patent Title: Optical filter comprising a variable transmittance layer
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Application No.: US16522420Application Date: 2019-07-25
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Publication No.: US11079617B2Publication Date: 2021-08-03
- Inventor: Neil Robin Branda , Zachary Bryce Erno , Jeremy Graham Finden , Duhane Lam , Charles Joseph Gongming Loo , Jonathan Ross Sargent , Matthew Paul Smit , Peter Alexander Von Hahn , Douglas Malcolm Wiggin
- Applicant: Solutia Canada Inc.
- Applicant Address: US MO St. Louis
- Assignee: Solutia Canada Inc.
- Current Assignee: Solutia Canada Inc.
- Current Assignee Address: US MO St. Louis
- Agent Michael K. Carrier
- Main IPC: G02F1/01
- IPC: G02F1/01 ; B32B37/12 ; B32B17/10 ; B60J3/04 ; G02F1/157 ; E06B9/24 ; G02B5/20 ; G02B5/23 ; G02C7/10

Abstract:
An optical filter comprising a variable transmittance layer having a first spectrum in a dark state, and a second spectrum in a faded state; and a color balancing layer having a third spectrum; each of the first, second and third spectra comprising a visible portion; the first and third spectra combining to provide a dark state spectrum approximating a dark state target color, and the second and third spectra combining to provide a faded state spectrum approximating a faded state target color. The optical filter may further comprise a light attenuating layer. The optical filter may further comprise part of a laminated glass.
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