FR647445A - Perfectionnements aux écrans de cinématographe - Google Patents

Perfectionnements aux écrans de cinématographe

Info

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
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.)
BRISTISH CONS INVEST CORP Ltd
Original Assignee
BRISTISH CONS INVEST CORP Ltd
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 BRISTISH CONS INVEST CORP Ltd filed Critical BRISTISH CONS INVEST CORP Ltd
Application granted granted Critical
Publication of FR647445A publication Critical patent/FR647445A/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)
FR647445D 1927-01-29 1928-01-18 Perfectionnements aux écrans de cinématographe Expired FR647445A (fr)

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 (fr) 1928-11-23

Family

ID=22058008

Family Applications (1)

Application Number Title Priority Date Filing Date
FR647445D Expired FR647445A (fr) 1927-01-29 1928-01-18 Perfectionnements aux écrans de cinématographe

Country Status (1)

Country Link
FR (1) FR647445A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5753240A (en) * 1994-09-21 1998-05-19 L'oreal Fluorinated compounds and compositions comprising them

Cited By (1)

* Cited by examiner, † Cited by third party
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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