Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Zeiss Ikon VEB
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Zeiss Ikon VEB
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Application filed by Zeiss Ikon VEBfiledCriticalZeiss Ikon VEB
Application grantedgrantedCritical
Publication of FR1183504ApublicationCriticalpatent/FR1183504A/fr
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—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
G03B21/00—Projectors or projection-type viewers; Accessories therefor
G03B21/14—Details
G03B21/16—Cooling; Preventing overheating
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR1183504D1957-09-271957-09-27Dispositif de contrôle du flux lumineux d'appareils de projection
ExpiredFR1183504A
(fr)