GB719269A - Improvements relating to the manufacture of electric discharge lamps - Google Patents
Improvements relating to the manufacture of electric discharge lampsInfo
- Publication number
- GB719269A GB719269A GB1755552A GB1755552A GB719269A GB 719269 A GB719269 A GB 719269A GB 1755552 A GB1755552 A GB 1755552A GB 1755552 A GB1755552 A GB 1755552A GB 719269 A GB719269 A GB 719269A
- Authority
- GB
- United Kingdom
- Prior art keywords
- envelope
- vapour
- hot
- discharge lamps
- treatment
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
- H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
719,269. Discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd. June 16, 1953 [July 11, 1952], No. 17555/52. Class 39(1) Glass envelope parts constructed wholly or in part of a glass of a borophosphate type for use in discharge lamps in which the discharge takes place in a vapour of an alkali metal, e.g. sodium, are treated, prior to their being brought info contact with the alkali metal vapour, by subjecting the parts to hot water at a temperature of about 70‹C for a period of up to 15 minutes, washing them with cold distilled water and finally drying them in-warm air at a temperature of about 30‹C. The treatment preferably takes place at the latest possible stage in the manufacture of the envelope of the lamp. The hot-washing step is preferably for 2 to 15 minutes in distilled water acidified with 0.2 per cent of nitric acid. The hot and cold water can be passed through the envelope without immersing in a bath where only the inside of the envelope requires treatment. The treatment removes surface contamination and materials such as sulphate and silicate of magnesium and iron which have a deleterious effect on the efficiency of sodium vapour lamps. Specification 675,594, [Group XXIII], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1755552A GB719269A (en) | 1952-07-11 | 1952-07-11 | Improvements relating to the manufacture of electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1755552A GB719269A (en) | 1952-07-11 | 1952-07-11 | Improvements relating to the manufacture of electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB719269A true GB719269A (en) | 1954-12-01 |
Family
ID=10097227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1755552A Expired GB719269A (en) | 1952-07-11 | 1952-07-11 | Improvements relating to the manufacture of electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB719269A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1154455A2 (en) * | 2000-05-09 | 2001-11-14 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for cleaning translucent tube for discharge lamp, and discharge lamp |
| DE102008050361B4 (en) * | 2007-10-05 | 2011-12-08 | Schott Ag | Process for cleaning or treating lamp glass tubes for use in fluorescent lamps |
-
1952
- 1952-07-11 GB GB1755552A patent/GB719269A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1154455A2 (en) * | 2000-05-09 | 2001-11-14 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for cleaning translucent tube for discharge lamp, and discharge lamp |
| EP1154455A3 (en) * | 2000-05-09 | 2003-12-03 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for cleaning translucent tube for discharge lamp, and discharge lamp |
| DE102008050361B4 (en) * | 2007-10-05 | 2011-12-08 | Schott Ag | Process for cleaning or treating lamp glass tubes for use in fluorescent lamps |
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