GB639335A - Improvements in and relating to optical glass - Google Patents
Improvements in and relating to optical glassInfo
- Publication number
- GB639335A GB639335A GB26175/47A GB2617547A GB639335A GB 639335 A GB639335 A GB 639335A GB 26175/47 A GB26175/47 A GB 26175/47A GB 2617547 A GB2617547 A GB 2617547A GB 639335 A GB639335 A GB 639335A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxides
- sept
- weight
- relating
- per cent
- 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
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
- C03C3/04—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
639,335. Glass manufacture. KODAK, Ltd. Sept. 26, 1947, No. 26175. Convention date, Sept. 28, 1946. [Class 56] A thorium-free glass contains at least some each of the oxides of B, La, Ta, and Zr to a total of at least 50 per cent by weight, and one or more of the oxides of W, Si, Zn and Ba. Many examples are given within the following percentage ranges by weight of oxide content : B 22-37, La 26-40, Ta 10-21, Zr 2-7, W 0-19, Si 0-6, Zn 0-6, BaO 0-19 ; some examples contain other oxides in amounts less than 5 per cent, such as Sr, Na, K, Al, Ca, Ti, Pb. The nD value generally lies between 1.73 and 1.76 and the Abbe value between 43 and 47. Specifications 462,304, 534,680, [Group IV], 608,298 and 615,286 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US639335XA | 1946-09-28 | 1946-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB639335A true GB639335A (en) | 1950-06-28 |
Family
ID=22052449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26175/47A Expired GB639335A (en) | 1946-09-28 | 1947-09-26 | Improvements in and relating to optical glass |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE476293A (en) |
| FR (1) | FR951839A (en) |
| GB (1) | GB639335A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1008455B (en) * | 1951-02-26 | 1957-05-16 | Jenaer Glaswerk Schott & Gen | Practically fluorine-free optical glasses |
| DE957338C (en) * | 1952-05-10 | 1957-03-07 | Jenaer Glaswerk Schott & Gen | Practically fluorine-free optical glasses |
-
0
- BE BE476293D patent/BE476293A/xx unknown
-
1947
- 1947-08-08 FR FR951839D patent/FR951839A/en not_active Expired
- 1947-09-26 GB GB26175/47A patent/GB639335A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE476293A (en) | |
| FR951839A (en) | 1949-11-04 |
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