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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American Optical Corp
Original Assignee
American Optical Corp
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Filing date
Publication date
Application filed by American Optical CorpfiledCriticalAmerican Optical Corp
Application grantedgrantedCritical
Publication of FR1099643ApublicationCriticalpatent/FR1099643A/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
G03B21/54—Accessories
G03B21/56—Projection screens
G03B21/60—Projection screens characterised by the nature of the surface
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR1099643D1953-04-061954-03-30Système optique pour la prise de vues et la projection d'images grand angulaires
ExpiredFR1099643A
(fr)
Dispositif destiné aux appareils de prises de vues cinématographiques ou photographiques, permettant de modifier la distance et, l'ouverture du diaphragme ou l'une desdeux pendant la visée