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H01J 40/20

Photoelectric discharge tubes not involving the ionisation of a gas having photo- emissive cathode, e.g. alkaline photoelectric cell wherein a light-ray scans a photo-emissive screen

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Edits on 16 Mar, 2022
"Entity importer update"
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Golden AI
edited on 16 Mar, 2022
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H01J 40/16
Edits on 5 Mar, 2022
"Created via: Entity Importer"
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Golden AI
created this topic on 5 Mar, 2022
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 H01J 40/20

Photoelectric discharge tubes not involving the ionisation of a gas having photo- emissive cathode, e.g. alkaline photoelectric cell wherein a light-ray scans a photo-emissive screen

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Cooperative Patent Classification
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http://data.epo.org/linked-data/def/cpc/H01J40-20

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