GB691230A - An improved projection screen unit - Google Patents
An improved projection screen unitInfo
- Publication number
- GB691230A GB691230A GB8759/51A GB875951A GB691230A GB 691230 A GB691230 A GB 691230A GB 8759/51 A GB8759/51 A GB 8759/51A GB 875951 A GB875951 A GB 875951A GB 691230 A GB691230 A GB 691230A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rods
- projection screen
- screen unit
- fastenings
- margins
- Prior art date
- 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
Links
Classifications
-
- G—PHYSICS
- 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
- G03B21/565—Screens allowing free passage of sound
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
691,230. Projection screens. SCHUMANN, M. April 16, 1951 [Sept. 6, 1950], No. 8759/51. Class 97 (i). A screen of polyvinyl sheet material haspockets round its margins to hold rods 7 and having cut-away portions 6 by which fastenings are attached to the rods. Such fastenings may be hooks 11 secured also to screw eyes 8 in the frame 1 or a cord 9 passed alternately round the rods and screw eyes. The pockets may be formed by turning over the margins of the screen material and securing by heat, sticking or sewing. The pocket may alternatively be made separately and of a different material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE691230X | 1950-09-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB691230A true GB691230A (en) | 1953-05-06 |
Family
ID=6600902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8759/51A Expired GB691230A (en) | 1950-09-06 | 1951-04-16 | An improved projection screen unit |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB691230A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2930652A1 (en) * | 2008-04-28 | 2009-10-30 | Screen Res Soc Par Actions Sim | PROJECTION SCREEN EQUIPPED WITH MEANS FOR EXERCISING VERTICAL AND HORIZONTAL TRACTION FORCES |
-
1951
- 1951-04-16 GB GB8759/51A patent/GB691230A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2930652A1 (en) * | 2008-04-28 | 2009-10-30 | Screen Res Soc Par Actions Sim | PROJECTION SCREEN EQUIPPED WITH MEANS FOR EXERCISING VERTICAL AND HORIZONTAL TRACTION FORCES |
WO2009136113A1 (en) * | 2008-04-28 | 2009-11-12 | Screen Research | Projector screen equipped with means for applying vertical and horizontal tensile forces |
US8120846B2 (en) | 2008-04-28 | 2012-02-21 | Yves Trelohan | Projector screen equipped with means for applying vertical and horizontal tensile forces |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR1245940A (en) | Frame with sheet stretched over this frame | |
GB763813A (en) | Laundry bag | |
GB691230A (en) | An improved projection screen unit | |
JPS51140625A (en) | Focal shutter | |
GB848628A (en) | Improvements in or relating to headwear | |
USD224197S (en) | Sewing machine cabinet | |
GB679778A (en) | Sound motion picture screen | |
USD154785S (en) | Design for a textile fabric | |
FR998715A (en) | Quilted bedspreads, quilts and quilts | |
USD166210S (en) | Woven plastic fabric | |
USD167170S (en) | Textile fabric | |
USD167172S (en) | Textile fabric | |
USD158252S (en) | Tripod top bracket for screens | |
USD153287S (en) | Design for a spectacle frame | |
GB639765A (en) | Improvements in or relating to mattresses | |
GB674420A (en) | Improvements in resilient surfaces for furniture or the like | |
GB683746A (en) | Improvements relating to lampshades | |
GB439582A (en) | An improved racket press | |
GB820242A (en) | Improvements in ventilators for windows | |
AU219620B2 (en) | Sewing machine with zigzag or ornamental stitching attachment | |
GB669299A (en) | Improvements in or relating to screens | |
AU150580B2 (en) | Attachment enabling hooks and eyes tobe sewn onto material by machine | |
ES32738U (en) | Improvements in protection screens (Machine-translation by Google Translate, not legally binding) | |
CA460047A (en) | Frame and the like | |
AU36751A (en) | Attachment enabling hooks and eyes tobe sewn onto material by machine |