GB1429283A - Overhead projector - Google Patents

Overhead projector

Info

Publication number
GB1429283A
GB1429283A GB2127874A GB2127874A GB1429283A GB 1429283 A GB1429283 A GB 1429283A GB 2127874 A GB2127874 A GB 2127874A GB 2127874 A GB2127874 A GB 2127874A GB 1429283 A GB1429283 A GB 1429283A
Authority
GB
United Kingdom
Prior art keywords
blower
current
intake
air
light source
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
GB2127874A
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.)
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
Publication of GB1429283A publication Critical patent/GB1429283A/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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Projection Apparatus (AREA)
GB2127874A 1973-06-27 1974-05-14 Overhead projector Expired GB1429283A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732333770 DE2333770A1 (de) 1973-06-27 1973-06-27 Tageslichtprojektor

Publications (1)

Publication Number Publication Date
GB1429283A true GB1429283A (en) 1976-03-24

Family

ID=5885804

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2127874A Expired GB1429283A (en) 1973-06-27 1974-05-14 Overhead projector

Country Status (6)

Country Link
BE (1) BE814852A (xx)
CH (1) CH566568A5 (xx)
DE (1) DE2333770A1 (xx)
DK (1) DK337674A (xx)
FR (1) FR2235628A5 (xx)
GB (1) GB1429283A (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410002A1 (de) * 1984-03-19 1985-09-19 Demolux Gmbh & Co Kg, 6070 Langen Overhead-projektor
US6497489B1 (en) * 2001-08-29 2002-12-24 Benq Corporation Projector with guiding rib in vent

Also Published As

Publication number Publication date
BE814852A (fr) 1974-11-18
DK337674A (xx) 1975-02-10
CH566568A5 (xx) 1975-09-15
FR2235628A5 (xx) 1975-01-24
DE2333770A1 (de) 1975-01-23

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee