4. Compositions
  5. Light transmission modifying compositions
  6. Displaying color change

Udo Weigand

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Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in...

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate

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H-annellated benzo[f]chromenes

Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Reexamination Certificate

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Heterocyclically annellated indenochromene derivatives

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate

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Neutral-colored gray photochromic plastic object

Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate

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Photochromic 3H-naphtho[2,1-b]-pyran compounds and...

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

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Profile ID: LFUS-PAI-P-1823489

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