IPC Subgroup
G03B 21/14 Details
Introduced: September 1968
Last revised: January 2006
Full Title
Projectors or projection-type viewers; Accessories therefor > Details
Classification Context
- Section:
- PHYSICS
- Class:
- PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- Subclass:
- APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
9 direct subcodes
Child Classifications
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- G03B 21/16 Cooling; Preventing overheating
- G03B 21/18 Fire preventing or extinguishing
- G03B 21/2 Lamp housings
- G03B 21/22 Soundproof bodies
- G03B 21/26 Projecting separately subsidiary matter simultaneously with main image
- G03B 21/28 Reflectors in projection beam
- G03B 21/3 adapted to collapse or fold, e.g. for portability
- G03B 21/32 Details specially adapted for motion-picture projection
- G03B 21/53 Means for automatic focusing, e.g. to compensate thermal effects