GB475771A - Improvements in electric incandescent lamps for photographic dark-room purposes - Google Patents

Improvements in electric incandescent lamps for photographic dark-room purposes

Info

Publication number
GB475771A
GB475771A GB10387/37A GB1038737A GB475771A GB 475771 A GB475771 A GB 475771A GB 10387/37 A GB10387/37 A GB 10387/37A GB 1038737 A GB1038737 A GB 1038737A GB 475771 A GB475771 A GB 475771A
Authority
GB
United Kingdom
Prior art keywords
electric incandescent
incandescent lamps
bulb
photographic dark
electric
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
GB10387/37A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB475771A publication Critical patent/GB475771A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

475,771. Electric incandescent lamp bulbs. GENERAL ELECTRIC CO., Ltd. April 12, 1937, No. 10387. Convention date, June 24, 1936. Drawings to Specification. [Class 39 (ii)] An electric incandescent lamp for use as a photographic dark room lamp has a bulb made of a glass which contains absorbing matter so that it transmits only red, orange or yellow light, the bulb being frosted on its interior surface and provided on its exterior surface with a layer of varnish transmitting substantially only light of the same colour as that transmitted by the glass bulb.
GB10387/37A 1936-06-24 1937-04-12 Improvements in electric incandescent lamps for photographic dark-room purposes Expired GB475771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE475771X 1936-06-24

Publications (1)

Publication Number Publication Date
GB475771A true GB475771A (en) 1937-11-25

Family

ID=6541901

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10387/37A Expired GB475771A (en) 1936-06-24 1937-04-12 Improvements in electric incandescent lamps for photographic dark-room purposes

Country Status (1)

Country Link
GB (1) GB475771A (en)

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