GB501252A - Improvements in or relating to electric incandescent lamps and discharge tubes - Google Patents
Improvements in or relating to electric incandescent lamps and discharge tubesInfo
- Publication number
- GB501252A GB501252A GB20398/38A GB2039838A GB501252A GB 501252 A GB501252 A GB 501252A GB 20398/38 A GB20398/38 A GB 20398/38A GB 2039838 A GB2039838 A GB 2039838A GB 501252 A GB501252 A GB 501252A
- Authority
- GB
- United Kingdom
- Prior art keywords
- changing
- red
- yellow
- compound
- cobalt
- 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
- H01J9/42—Measurement or testing during manufacture
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
501,252. Indicating used life of electric lamps. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN: July 9, 1938" No. 20398. Convention date, .July 12, 1937. [Class 97 (iii)] The used life of an electric incandescent lamp or discharge tube is indicated by the change in colour of a compound of cobalt with zinc or aluminium. The Figure shows on incandescent lamp in which the compound is contained in a ball 13 at the bottom of the supporting rod 12. A compound of cobalt with zinc oxide, when moderately heated changes from white to green, i.e. Rinman's Green. By moderately heating a compound of cobalt with aluminium oxide a green discoloration is obtained. Upon further heating a blue colour, i.e. Thenard's Blue is obtained. The Specification as open to inspection under Sect. 91 describes the use of yellow tungsten bronze (Na2W 2O6) changing under prolonged heating at 500‹ C. from bright yellow through intermediate tones to black, red realgar changing under prolonged heating between 200 to 250‹ C. to black, SbI3 changing from yellow to red at 114‹ C., As2S3 changing from yellow to red at 170‹ C., HgI2 changing from red to yellow at 125‹ C., Sb2S3 changing from red to black at 200‹ C., mercuro-salts'or alkaline chloride decomposing under ultraviolet rays, or of materials which sublime or volatilize. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE217624X | 1937-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB501252A true GB501252A (en) | 1939-02-23 |
Family
ID=5830861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20398/38A Expired GB501252A (en) | 1937-07-12 | 1938-07-09 | Improvements in or relating to electric incandescent lamps and discharge tubes |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE429096A (en) |
| CH (1) | CH217624A (en) |
| FR (1) | FR840585A (en) |
| GB (1) | GB501252A (en) |
| NL (1) | NL54814C (en) |
-
0
- NL NL54814D patent/NL54814C/xx active
- BE BE429096D patent/BE429096A/xx unknown
-
1938
- 1938-07-09 GB GB20398/38A patent/GB501252A/en not_active Expired
- 1938-07-12 CH CH217624D patent/CH217624A/en unknown
- 1938-07-12 FR FR840585D patent/FR840585A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE429096A (en) | |
| CH217624A (en) | 1941-10-31 |
| FR840585A (en) | 1939-04-27 |
| NL54814C (en) |
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