GB543441A - Improved glass compositions and seals for sodium vapour electric discharge lamps made therewith - Google Patents
Improved glass compositions and seals for sodium vapour electric discharge lamps made therewithInfo
- Publication number
- GB543441A GB543441A GB31541A GB31541A GB543441A GB 543441 A GB543441 A GB 543441A GB 31541 A GB31541 A GB 31541A GB 31541 A GB31541 A GB 31541A GB 543441 A GB543441 A GB 543441A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- oxide
- glass
- alumina
- plus
- 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
- C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
- C03C27/04—Joining glass to metal by means of an interlayer
- C03C27/042—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts
- C03C27/044—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts of glass, glass-ceramic or ceramic material only
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
543,441. Glass manufacture. BRITISH THOMSON-HOUSTON CO., Ltd., and STANWORTH, J. E. Jan. 9, 1941, No. 315. [Class 56] [Also in Group XXXVI] Relates to glass suitable for sheathing a copper coated lead-in wire that is to be sealed into the glass envelope of a sodium vapour electric discharge lamp. According to the invention, the glass comprises 60-65 per cent. of silica plus boric oxide plus alumina (the boric oxide and alumina both being less than 5 per cent.), 21-25 percent, of barium oxide plus calcium oxide (the calcium oxide being less than 7 per cent.), and 12.5-14 per cent. of soda plus potash (the potash being less than 5 per cent.). A preferred composition consists of 59.7 per cent. of silica, 22.8 per cent. of barium oxide, 13.1 per cent. of soda, and 4.4 per cent. of alumina. A lead-in sheathed with this glass may be sealed into a glass envelope which is coated on the inside with a sodium-resistant glass composed of 27.0 per cent. of alumina, 36.0 per cent. of barium oxide, 30.4 per cent. of boric oxide, 2.2 per cent. of potassium oxide, and 4.4 per cent. of sodium oxide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB31541A GB543441A (en) | 1941-01-09 | 1941-01-09 | Improved glass compositions and seals for sodium vapour electric discharge lamps made therewith |
| FR919190D FR919190A (en) | 1941-01-09 | 1945-12-20 | Composite glasses and sealing for sodium vapor lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB31541A GB543441A (en) | 1941-01-09 | 1941-01-09 | Improved glass compositions and seals for sodium vapour electric discharge lamps made therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB543441A true GB543441A (en) | 1942-02-25 |
Family
ID=9702229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31541A Expired GB543441A (en) | 1941-01-09 | 1941-01-09 | Improved glass compositions and seals for sodium vapour electric discharge lamps made therewith |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR919190A (en) |
| GB (1) | GB543441A (en) |
-
1941
- 1941-01-09 GB GB31541A patent/GB543441A/en not_active Expired
-
1945
- 1945-12-20 FR FR919190D patent/FR919190A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR919190A (en) | 1947-02-28 |
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