GB534680A - New or improved glasses - Google Patents

New or improved glasses

Info

Publication number
GB534680A
GB534680A GB2744139A GB2744139A GB534680A GB 534680 A GB534680 A GB 534680A GB 2744139 A GB2744139 A GB 2744139A GB 2744139 A GB2744139 A GB 2744139A GB 534680 A GB534680 A GB 534680A
Authority
GB
United Kingdom
Prior art keywords
oxide
per cent
oxides
glass
thorium
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
GB2744139A
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.)
Kodak Ltd
Original Assignee
Kodak Ltd
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 Kodak Ltd filed Critical Kodak Ltd
Priority to GB2744139A priority Critical patent/GB534680A/en
Publication of GB534680A publication Critical patent/GB534680A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/14—Silica-free oxide glass compositions containing boron
    • C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/14—Silica-free oxide glass compositions containing boron
    • C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
    • C03C3/155—Silica-free oxide glass compositions containing boron containing rare earths containing zirconium, titanium, tantalum or niobium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

534,680. Glass manufacture. KODAK, Ltd. (Eastman Kodak Co.). Oct. 7, 1939, No. 27441. Addition to 462,304. Drawings to Specification. [Class 56] An optical glass having a high combined refractive and dispersive index is made by fusing a batch containing the oxides of lanthanum, thorium, and boron together with tantalum oxide or tungsten oxide, or both, and either barium oxide, calcium oxide, strontium oxide, or magnesium oxide, or more than one of these last named oxides, but not containing more than 10 per cent. of silica. The batch may also contain a small proportion of sodium oxide, potassium oxide, lithium oxide, aluminium oxide, or beryllium oxide, or more than one of these oxides. A number of compositions are given in the Specification. For example, 28 per cent. of lanthanum oxide, 18 per cent. of tantalum oxide, 12 per cent. of thorium oxide, 12 per cent. of barium oxide, and 30 per cent. of boric oxide produce a glass which has a refractive index of 1.750 and a dispersive index of 47.
GB2744139A 1939-10-07 1939-10-07 New or improved glasses Expired GB534680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2744139A GB534680A (en) 1939-10-07 1939-10-07 New or improved glasses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2744139A GB534680A (en) 1939-10-07 1939-10-07 New or improved glasses

Publications (1)

Publication Number Publication Date
GB534680A true GB534680A (en) 1941-03-13

Family

ID=10259643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2744139A Expired GB534680A (en) 1939-10-07 1939-10-07 New or improved glasses

Country Status (1)

Country Link
GB (1) GB534680A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2368856A1 (en) * 2008-11-10 2011-09-28 Hoya Corporation Method for producing glass, optical glass, glass material for press molding, optical element and methods for producing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2368856A1 (en) * 2008-11-10 2011-09-28 Hoya Corporation Method for producing glass, optical glass, glass material for press molding, optical element and methods for producing same
EP2368856A4 (en) * 2008-11-10 2013-05-01 Hoya Corp Method for producing glass, optical glass, glass material for press molding, optical element and methods for producing same

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