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.)
Expired
Application number
GB813/60A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
Agfa AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agfa AGfiledCriticalAgfa AG
Publication of GB867180ApublicationCriticalpatent/GB867180A/en
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
G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Overhead Projectors And Projection Screens
(AREA)
Abstract
867,180. Projection screens. AGFA A. G. Jan. 8. 1960 [Jan. 22, 1959], No. 813/60. Class 97(1) An optical projection screen has a screen proper 1 which may be rolled up; and has two pockets 2 each of which holds a batten 3 comprising two detached sections (only one shown), each pocket being attached to an end of each batten section at 4, the pockets and battens being surrounded by slotted tubes 7 and means being provided, connected to each batten section at 4, for tensioning the pocket and therefore the web in the longitudinal direction of the batten. In the screen shown said means comprise slightly elastic strings 5 passing through the ends of the tubes 7 and over the ends of a rod 11 said rod enabling the web to be tensioned longitudinally.
GB813/60A1959-01-221960-01-08Screen for optical projection
ExpiredGB867180A
(en)
A procedure with its corresponding devices to group and retain integrating elements of a construction (Machine-translation by Google Translate, not legally binding)