Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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5/00
Optical elements other than lenses
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G02B5/1866
Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
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G02B5/1871
Transmissive phase gratings
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