IPC Subgroup
G03B 21/32 Details specially adapted for motion-picture projection
Introduced: September 1968
Last revised: January 2006
Full Title
Projectors or projection-type viewers; Accessories therefor > Details > Details specially adapted for motion-picture projection
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
6 direct subcodes
Child Classifications
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- G03B 21/34 Change-over arrangements
- G03B 21/38 Prolonged exhibition of single frame
- G03B 21/4 Eliminating or reducing effect of flicker
- G03B 21/42 Preventing damage to film due to abnormal operation of projector
- G03B 21/43 Driving mechanisms
- G03B 21/5 Control devices operated by the film strip during the run