GB540009A - Improvements in and in the manufacture of projection screens - Google Patents
Improvements in and in the manufacture of projection screensInfo
- Publication number
- GB540009A GB540009A GB839341A GB839341A GB540009A GB 540009 A GB540009 A GB 540009A GB 839341 A GB839341 A GB 839341A GB 839341 A GB839341 A GB 839341A GB 540009 A GB540009 A GB 540009A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- margins
- warp
- yarns
- reinforced asbestos
- 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)
- Woven Fabrics (AREA)
Abstract
540,009. Projection screens; woven fabrics. JOHNSON & SONS Ltd., C. H., and PARRETT, H. H. March 6, 1941, No. 8393. Divided out of 538,469. [Class 142 (iv)] [Also in Group XX] In a fire-proof projection screen having continuous lines of uniformly spaced sound apertures produced by weaving, the warp or weft of the screen is formed of spaced strips, tapes or groups of reinforced asbestos having margins of fine wire with the weft or warp wholly formed of a succession of uniformly spaced fine wires; the apertures thus have a wire edging or boundary. As shown, in Fig. 1, the spaced strips of reinforced asbestos yarns b<SP>2</SP> with the wire margins b<SP>1</SP> form the warps and are woven together by the fine wire wefts c<SP>2</SP>. In Fig. 3, the groups of reinforced asbestos yarns and the wire margins b<SP>1</SP> are individually woven with the wire wefts c<SP>3</SP> while in Fig. 5, double ends b<SP>4</SP> of reinforced asbestos yarn are used as warp with three wires bIX for each group of yarns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB839341A GB540009A (en) | 1941-03-06 | 1941-03-06 | Improvements in and in the manufacture of projection screens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB839341A GB540009A (en) | 1941-03-06 | 1941-03-06 | Improvements in and in the manufacture of projection screens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB540009A true GB540009A (en) | 1941-10-01 |
Family
ID=9851654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB839341A Expired GB540009A (en) | 1941-03-06 | 1941-03-06 | Improvements in and in the manufacture of projection screens |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB540009A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006048473A1 (en) * | 2006-10-11 | 2008-04-17 | Sefar Ag | Rear projection fabric, rear projection screen and rear projection system |
-
1941
- 1941-03-06 GB GB839341A patent/GB540009A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006048473A1 (en) * | 2006-10-11 | 2008-04-17 | Sefar Ag | Rear projection fabric, rear projection screen and rear projection system |
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