FR670973A - Perfectionnements aux écrans cinématographiques - Google Patents

Perfectionnements aux écrans cinématographiques

Info

Publication number
FR670973A
FR670973A FR670973DA FR670973A FR 670973 A FR670973 A FR 670973A FR 670973D A FR670973D A FR 670973DA FR 670973 A FR670973 A FR 670973A
Authority
FR
France
Prior art keywords
cinematographic
screens
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
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Da Lite Screen & Scenic Co Soc
Original Assignee
Da Lite Screen & Scenic Co Soc
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 by Da Lite Screen & Scenic Co Soc filed Critical Da Lite Screen & Scenic Co Soc
Application granted granted Critical
Publication of FR670973A publication Critical patent/FR670973A/fr
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)
FR670973D 1929-03-06 1929-03-06 Perfectionnements aux écrans cinématographiques Expired FR670973A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR670973T 1929-03-06

Publications (1)

Publication Number Publication Date
FR670973A true FR670973A (fr) 1929-12-06

Family

ID=9016712

Family Applications (1)

Application Number Title Priority Date Filing Date
FR670973D Expired FR670973A (fr) 1929-03-06 1929-03-06 Perfectionnements aux écrans cinématographiques

Country Status (1)

Country Link
FR (1) FR670973A (fr)

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