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FR517694A - screens for projection devices - Google Patents

screens for projection devices

Info

Publication number
FR517694A
FR517694A FR517694A FR517694DA FR517694A FR 517694 A FR517694 A FR 517694A FR 517694 A FR517694 A FR 517694A FR 517694D A FR517694D A FR 517694DA FR 517694 A FR517694 A FR 517694A
Authority
FR
France
Prior art keywords
screens
projection devices
projection
devices
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
FR517694A
Other languages
French (fr)
Inventor
John Frederick Robert Troeger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR517694A publication Critical patent/FR517694A/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
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR517694A 1913-12-24 1920-06-23 screens for projection devices Expired FR517694A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US517694XA 1913-12-24 1913-12-24

Publications (1)

Publication Number Publication Date
FR517694A true FR517694A (en) 1921-05-10

Family

ID=21973274

Family Applications (1)

Application Number Title Priority Date Filing Date
FR517694A Expired FR517694A (en) 1913-12-24 1920-06-23 screens for projection devices

Country Status (1)

Country Link
FR (1) FR517694A (en)

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