HK1006878A1 - Folding arm for overhead projector - Google Patents

Folding arm for overhead projector Download PDF

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Publication number
HK1006878A1
HK1006878A1 HK98105952A HK98105952A HK1006878A1 HK 1006878 A1 HK1006878 A1 HK 1006878A1 HK 98105952 A HK98105952 A HK 98105952A HK 98105952 A HK98105952 A HK 98105952A HK 1006878 A1 HK1006878 A1 HK 1006878A1
Authority
HK
Hong Kong
Prior art keywords
projector
arm
mirror
head
housing
Prior art date
Application number
HK98105952A
Other languages
German (de)
English (en)
French (fr)
Chinese (zh)
Other versions
HK1006878B (en
Inventor
S Carpenter Robert
J Roden Dennis
Original Assignee
Minnesota Mining And Manufacturing Company
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 Minnesota Mining And Manufacturing Company filed Critical Minnesota Mining And Manufacturing Company
Publication of HK1006878A1 publication Critical patent/HK1006878A1/en
Publication of HK1006878B publication Critical patent/HK1006878B/en

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
    • Y10S353/04—Opaque

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
HK98105952.8A 1990-03-01 1998-06-22 Folding arm for overhead projector HK1006878B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/486,971 US4978218A (en) 1990-03-01 1990-03-01 Folding arm for overhead projector
US486971 1990-03-01

Publications (2)

Publication Number Publication Date
HK1006878A1 true HK1006878A1 (en) 1999-03-19
HK1006878B HK1006878B (en) 1999-03-19

Family

ID=

Also Published As

Publication number Publication date
CA2036932A1 (en) 1991-09-02
EP0444904A3 (en) 1991-11-21
EP0444904A2 (en) 1991-09-04
JP2591867Y2 (ja) 1999-03-10
JP2585144Y2 (ja) 1998-11-11
US4978218A (en) 1990-12-18
DE9102361U1 (de) 1991-07-11
DE9102362U1 (de) 1991-07-04
CA2036932C (en) 2001-11-27
JPH0489938U (OSRAM) 1992-08-05
EP0444904B1 (en) 1995-02-08
JPH0489939U (OSRAM) 1992-08-05

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20040227

PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)