4. Stock material or miscellaneous articles
  5. Composite

Clara E. Nelson

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Indeno-fused photochromic naphthopyrans, naphthols and...

Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen in the nitrogen containing substituent
Reexamination Certificate

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Photochromic articles that activate behind ultraviolet...

Stock material or miscellaneous articles – Composite
Reexamination Certificate

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Photochromic articles with reduced temperature dependency...

Stock material or miscellaneous articles – Composite
Reexamination Certificate

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Photochromic articles with reduced temperature dependency...

Stock material or miscellaneous articles – Composite
Reexamination Certificate

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