FR640033A - Improvements to screens for light projections - Google Patents
Improvements to screens for light projectionsInfo
- Publication number
- FR640033A FR640033A FR640033DA FR640033A FR 640033 A FR640033 A FR 640033A FR 640033D A FR640033D A FR 640033DA FR 640033 A FR640033 A FR 640033A
- Authority
- FR
- France
- Prior art keywords
- screens
- light projections
- projections
- light
- 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
- G03B21/60—Projection screens characterised by the nature of the surface
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE640033X | 1926-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR640033A true FR640033A (en) | 1928-07-04 |
Family
ID=3876345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR640033D Expired FR640033A (en) | 1926-08-27 | 1927-08-26 | Improvements to screens for light projections |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR640033A (en) |
-
1927
- 1927-08-26 FR FR640033D patent/FR640033A/en not_active Expired
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