FR451341A - Improvements in projection devices - Google Patents

Improvements in projection devices

Info

Publication number
FR451341A
FR451341A FR451341A FR451341DA FR451341A FR 451341 A FR451341 A FR 451341A FR 451341 A FR451341 A FR 451341A FR 451341D A FR451341D A FR 451341DA FR 451341 A FR451341 A FR 451341A
Authority
FR
France
Prior art keywords
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
FR451341A
Other languages
French (fr)
Inventor
Henri Durand
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 FR451341A publication Critical patent/FR451341A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR451341A 1912-12-04 1912-12-04 Improvements in projection devices Expired FR451341A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR451341T 1912-12-04

Publications (1)

Publication Number Publication Date
FR451341A true FR451341A (en) 1913-04-16

Family

ID=1491682

Family Applications (1)

Application Number Title Priority Date Filing Date
FR451341A Expired FR451341A (en) 1912-12-04 1912-12-04 Improvements in projection devices

Country Status (1)

Country Link
FR (1) FR451341A (en)

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