4. Optical: systems and elements
  5. Absorption filter
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Diaphragm device

Optical: systems and elements – Absorption filter – Movable in or out of optical path
Reexamination Certificate

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Dioxazine sulfamoyl compound, coloring powder composition...

Optical: systems and elements – Absorption filter
Reexamination Certificate

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Diphenylsquarylium compound and filter for display...

Optical: systems and elements – Absorption filter
Reexamination Certificate

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Dispersive fabry-perot infrared multiwavelength optical filter

Optical: systems and elements – Absorption filter
Patent

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Dual complementary two-color optics which enables a user to...

Optical: systems and elements – Absorption filter – Neutral or graded density
Reexamination Certificate

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Dye combinations for multiple bandpass filters for video...

Optical: systems and elements – Absorption filter
Reexamination Certificate

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Dynamic filter structures

Optical: systems and elements – Absorption filter
Patent

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