Particles of a window for varying the degree of light...

Passive protection of optically sensitive materials with transit

Patterning an optical property on an optical element

Phosphorous polymers

Photoactive taggant materials comprising semiconductor...

Photochromatic and thermochromatic compounds and their applicati

Photochromatic composition and photochromatic articles which con

Photochromatic composition endowed with light fatigue resistance

Photochromic 3H-naphthopyrans

Photochromic and/or cathodochromic sodalite material, method of

Photochromic article

Photochromic article

Photochromic article

Photochromic articles

Photochromic articles

Photochromic articles with thermally stable photocolorability

Photochromic benzopyrano-fused naphthopyrans

Photochromic benzopyrano-fused naphthopyrans

Photochromic chromene compounds

Photochromic chromene derivatives