GB765405A - Improvements in or relating to electric incandescent lamps - Google Patents
Improvements in or relating to electric incandescent lampsInfo
- Publication number
- GB765405A GB765405A GB5435/55A GB543555A GB765405A GB 765405 A GB765405 A GB 765405A GB 5435/55 A GB5435/55 A GB 5435/55A GB 543555 A GB543555 A GB 543555A GB 765405 A GB765405 A GB 765405A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphate
- water
- bulb
- layer
- suspension
- 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
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/22—Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
- H01K3/005—Methods for coating the surface of the envelope
-
- 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
- C03C2217/00—Coatings on glass
- C03C2217/20—Materials for coating a single layer on glass
- C03C2217/29—Mixtures
-
- 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
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
- C03C2218/114—Deposition methods from solutions or suspensions by brushing, pouring or doctorblading
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
765,405. Electric incandescent lamps. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 23, 1955 [Feb. 26, 1954], No; 5435/55. Class 39(2) The bulb of an electric incandescent lamp is provided with an internal coating layer of powdery light-diffusing material consisting of an alkaline earth phosphate which is insoluble in water. Preferably the phosphate has apatite structure. The method of applying the light-diffusing layer comprises the steps of applying to the inside surface of the bulb, a stable suspension of an alkaline earth phosphate, which is insoluble in water, to which is added at least 1.5 per cent (calculated on the phosphate) of phosphoric acid, or a compound or compounds which produce this amount of phosphoric acid, in a volatile organic liquid which is miscible with water, said suspension preferably having a water content of about 3 per cent (also calculated on the phosphate), the resultant layer after drying, being heated to a temperature of at least 200‹C. In an example 3750 grams of 3 Ca 3 (PO 4 ) 2 . CaF 2 or 3 Ca 3 - (PO 4 ) 2 . Ca(OH) 2 are ground with 135 c.c. of water, 155 c.c. of phosphoric acid (specific weight 1.75) and 3.75 litres of methanol for 96 hours in a porcelain ball-mill having a capacity of 15 litres with the use of 10 kgs. of flint stones of 2 cms. in diameter at 60 revolutions per minute. The phosphate particles after this treatment are smaller than 3 microns. The suspension obtained is finally diluted with 10.4 litres of ethanol and sprayed upon the inner surface of a lamp bulb and, after draining away the excess suspension, the remaining layer is dried by blowing in hot air. At the areas at which other parts are to be sealed to the bulb in manufacturing a lamp the layer is removed by a rotating brush, .and the remainder is then heated at 500‹C. for one minute.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL330408X | 1954-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB765405A true GB765405A (en) | 1957-01-09 |
Family
ID=19784345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5435/55A Expired GB765405A (en) | 1954-02-26 | 1955-02-23 | Improvements in or relating to electric incandescent lamps |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE536018A (en) |
| CH (1) | CH330408A (en) |
| DE (1) | DE962096C (en) |
| GB (1) | GB765405A (en) |
| NL (1) | NL86346C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2963611A (en) * | 1954-07-19 | 1960-12-06 | Westinghouse Electric Corp | Incandescent lamp |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE830983C (en) * | 1949-03-24 | 1952-02-11 | Patra Patent Treuhand | Process for achieving a thin coating layer of fine-grained powder materials on the glass vessels of electric lamps and the like. like |
-
0
- NL NL86346D patent/NL86346C/xx active
- BE BE536018D patent/BE536018A/xx unknown
-
1955
- 1955-02-23 GB GB5435/55A patent/GB765405A/en not_active Expired
- 1955-02-24 DE DEN10246A patent/DE962096C/en not_active Expired
- 1955-02-24 CH CH330408D patent/CH330408A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2963611A (en) * | 1954-07-19 | 1960-12-06 | Westinghouse Electric Corp | Incandescent lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CH330408A (en) | 1958-06-15 |
| NL86346C (en) | |
| BE536018A (en) | |
| DE962096C (en) | 1957-04-18 |
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