FI875763A0 - Ritningsprojektor. - Google Patents

Ritningsprojektor.

Info

Publication number
FI875763A0
FI875763A0 FI875763A FI875763A FI875763A0 FI 875763 A0 FI875763 A0 FI 875763A0 FI 875763 A FI875763 A FI 875763A FI 875763 A FI875763 A FI 875763A FI 875763 A0 FI875763 A0 FI 875763A0
Authority
FI
Finland
Prior art keywords
ritningsprojektor
Prior art date
Application number
FI875763A
Other languages
English (en)
Other versions
FI88214C (fi
FI875763A (fi
FI88214B (fi
Inventor
Tarik Al-Ani
Original Assignee
Educatek Oy
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 Educatek Oy filed Critical Educatek Oy
Priority to FI875763A priority Critical patent/FI88214C/fi
Publication of FI875763A0 publication Critical patent/FI875763A0/fi
Priority to PCT/FI1989/000124 priority patent/WO1991000546A1/en
Priority to US07/778,967 priority patent/US5214459A/en
Priority to EP89907761A priority patent/EP0479779A1/en
Publication of FI875763A publication Critical patent/FI875763A/fi
Application granted granted Critical
Publication of FI88214B publication Critical patent/FI88214B/fi
Publication of FI88214C publication Critical patent/FI88214C/fi

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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S353/00—Optics: image projectors
    • Y10S353/03—Transparent
FI875763A 1987-12-30 1987-12-30 Bildkastare FI88214C (fi)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FI875763A FI88214C (fi) 1987-12-30 1987-12-30 Bildkastare
PCT/FI1989/000124 WO1991000546A1 (en) 1987-12-30 1989-06-28 Overhead projector
US07/778,967 US5214459A (en) 1987-12-30 1989-06-28 Overhead projectors
EP89907761A EP0479779A1 (en) 1987-12-30 1989-06-28 Overhead projector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI875763A FI88214C (fi) 1987-12-30 1987-12-30 Bildkastare
FI875763 1987-12-30

Publications (4)

Publication Number Publication Date
FI875763A0 true FI875763A0 (fi) 1987-12-30
FI875763A FI875763A (fi) 1989-07-01
FI88214B FI88214B (fi) 1992-12-31
FI88214C FI88214C (fi) 1993-04-13

Family

ID=8525639

Family Applications (1)

Application Number Title Priority Date Filing Date
FI875763A FI88214C (fi) 1987-12-30 1987-12-30 Bildkastare

Country Status (4)

Country Link
US (1) US5214459A (fi)
EP (1) EP0479779A1 (fi)
FI (1) FI88214C (fi)
WO (1) WO1991000546A1 (fi)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269680A (en) * 1992-08-13 1994-02-16 David Main Overhead projector display device having slidable support frame and opaque blind
US5823651A (en) * 1996-10-07 1998-10-20 Helot; Jacques H. Display adapter for overhead projector presentation
US6017124A (en) * 1998-06-25 2000-01-25 Siems; Kent Shielding device for the reduction of unwanted reflection from an overhead projector

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1234408B (de) * 1961-12-11 1967-02-16 Voigtlaender Ag Dia- oder Laufbildprojektor mit veraenderbarer Blende
US3531193A (en) * 1967-08-11 1970-09-29 Robert B Diehl Transparency holder for overhead projections
SE348564B (fi) * 1967-10-04 1972-09-04 Minnesota Mining & Mfg
US3661449A (en) * 1969-05-19 1972-05-09 John S Wright Overhead visual shutter device
DE7013649U (de) * 1970-04-09 1970-08-20 Ritzerfeld Gerhard Schreibprojektor.
US3785729A (en) * 1971-03-01 1974-01-15 C Dasher Overhead projector roller assembly
DE2156275A1 (de) * 1971-11-12 1973-05-17 Braun Ag Folienkassette fuer schreibprojektoren
GB1431542A (en) * 1972-04-12 1976-04-07 Graeme J H Film feeding attachment for use with an overhead projector
JPS5760323A (en) * 1980-09-26 1982-04-12 Minolta Camera Co Ltd Exposure controlling device for copying equipment
DE3105682A1 (de) * 1981-02-17 1982-11-25 Pelikan Informationstechnik GmbH & Co KG, 2000 Hamburg "arbeitsprojektor"
DE3205642A1 (de) * 1982-02-17 1983-08-25 Demolux Gmbh & Co Kg, 6070 Langen Schreibprojektor
DE3208723A1 (de) * 1982-03-11 1983-09-22 Demolux Gmbh & Co Kg, 6070 Langen Schreibprojektor
DE3233257A1 (de) * 1982-09-08 1984-03-08 Demolux Gmbh & Co Kg, 6070 Langen Overhead-projektor
JPS6117134A (ja) * 1984-04-13 1986-01-25 デモルツクス・ゲ−・エム・ベ−・ハ−・ウント・コンパニ−・カ−・ゲ− オ−バ−ヘッド型プロジェクタ
DE3425323A1 (de) * 1984-07-10 1986-01-16 Demolux Overhead-projektor
SE459288B (sv) * 1987-08-24 1989-06-19 Carl Eric Ohlson Saett vid granskning av roentgenfilm och liknande samt granskningsskaap foer saadan filmgranskning
US4942411A (en) * 1988-06-27 1990-07-17 Polston Steve A Automatic overlay feed apparatus for an overhead projector
US4944586A (en) * 1989-11-30 1990-07-31 E. I. Du Pont De Nemours And Company Automated transparency organizer
US5052798A (en) * 1990-03-23 1991-10-01 Terry L. Mardis Highlighted module for overhead view projector

Also Published As

Publication number Publication date
US5214459A (en) 1993-05-25
EP0479779A1 (en) 1992-04-15
FI88214C (fi) 1993-04-13
FI875763A (fi) 1989-07-01
FI88214B (fi) 1992-12-31
WO1991000546A1 (en) 1991-01-10

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Legal Events

Date Code Title Description
MM Patent lapsed
MM Patent lapsed

Owner name: EDUCATEK OY