FR647445A - Improvements to cinematograph screens - Google Patents
Improvements to cinematograph screensInfo
- Publication number
- FR647445A FR647445A FR647445DA FR647445A FR 647445 A FR647445 A FR 647445A FR 647445D A FR647445D A FR 647445DA FR 647445 A FR647445 A FR 647445A
- Authority
- FR
- France
- Prior art keywords
- cinematograph
- screens
- cinematograph screens
- 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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US647445XA | 1927-01-29 | 1927-01-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR647445A true FR647445A (en) | 1928-11-23 |
Family
ID=22058008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR647445D Expired FR647445A (en) | 1927-01-29 | 1928-01-18 | Improvements to cinematograph screens |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR647445A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5753240A (en) * | 1994-09-21 | 1998-05-19 | L'oreal | Fluorinated compounds and compositions comprising them |
-
1928
- 1928-01-18 FR FR647445D patent/FR647445A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5753240A (en) * | 1994-09-21 | 1998-05-19 | L'oreal | Fluorinated compounds and compositions comprising them |
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