FR814991A - porous projection screen for sound films - Google Patents
porous projection screen for sound filmsInfo
- Publication number
- FR814991A FR814991A FR814991DA FR814991A FR 814991 A FR814991 A FR 814991A FR 814991D A FR814991D A FR 814991DA FR 814991 A FR814991 A FR 814991A
- Authority
- FR
- France
- Prior art keywords
- projection screen
- sound films
- porous projection
- porous
- films
- 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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR814991T | 1936-11-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR814991A true FR814991A (en) | 1937-07-03 |
Family
ID=9267031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR814991D Expired FR814991A (en) | 1936-11-19 | 1936-11-19 | porous projection screen for sound films |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR814991A (en) |
-
1936
- 1936-11-19 FR FR814991D patent/FR814991A/en not_active Expired
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