BE389200A - - Google Patents
Info
- Publication number
- BE389200A BE389200A BE389200DA BE389200A BE 389200 A BE389200 A BE 389200A BE 389200D A BE389200D A BE 389200DA BE 389200 A BE389200 A BE 389200A
- Authority
- BE
- Belgium
- Prior art keywords
- screen
- sheets
- perforated
- transparent
- opaque
- Prior art date
Links
- 239000000463 material Substances 0.000 claims description 10
- 239000012780 transparent material Substances 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 108010010803 Gelatin Proteins 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 229920002301 cellulose acetate Polymers 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims description 2
- 238000004049 embossing Methods 0.000 claims description 2
- 229920000159 gelatin Polymers 0.000 claims description 2
- 239000008273 gelatin Substances 0.000 claims description 2
- 235000019322 gelatine Nutrition 0.000 claims description 2
- 235000011852 gelatine desserts Nutrition 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 claims 1
- 238000010348 incorporation Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229920002160 Celluloid Polymers 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE389200A true BE389200A (cs) |
Family
ID=57357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE389200D BE389200A (cs) |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE389200A (cs) |
-
0
- BE BE389200D patent/BE389200A/fr unknown
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