FR694128A - Improvements to sound cinematographic screens - Google Patents

Improvements to sound cinematographic screens

Info

Publication number
FR694128A
FR694128A FR694128DA FR694128A FR 694128 A FR694128 A FR 694128A FR 694128D A FR694128D A FR 694128DA FR 694128 A FR694128 A FR 694128A
Authority
FR
France
Prior art keywords
cinematographic
screens
sound
sound cinematographic
cinematographic 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
Application number
Other languages
French (fr)
Inventor
Ephraim Banning
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 FR694128A publication Critical patent/FR694128A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR694128D 1929-04-27 1930-04-17 Improvements to sound cinematographic screens Expired FR694128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US694128XA 1929-04-27 1929-04-27

Publications (1)

Publication Number Publication Date
FR694128A true FR694128A (en) 1930-11-28

Family

ID=22088813

Family Applications (1)

Application Number Title Priority Date Filing Date
FR694128D Expired FR694128A (en) 1929-04-27 1930-04-17 Improvements to sound cinematographic screens

Country Status (1)

Country Link
FR (1) FR694128A (en)

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