FR814991A - porous projection screen for sound films - Google Patents

porous projection screen for sound films

Info

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
Application number
Other languages
French (fr)
Inventor
Karl Patzwaldt
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR814991A publication Critical patent/FR814991A/en
Expired legal-status Critical Current

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
FR814991D 1936-11-19 1936-11-19 porous projection screen for sound films Expired FR814991A (en)

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)

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