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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JULIUS SCHWEIKART
Original Assignee
JULIUS SCHWEIKART
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Filing date
Publication date
Application filed by JULIUS SCHWEIKARTfiledCriticalJULIUS SCHWEIKART
Application grantedgrantedCritical
Publication of FR388978ApublicationCriticalpatent/FR388978A/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)
FR388978A1908-04-061908-04-06Procédé de fabrication d'écrans de projection
ExpiredFR388978A
(fr)