US1623784A - Incandescent filament - Google Patents
Incandescent filament Download PDFInfo
- Publication number
- US1623784A US1623784A US635970A US63597023A US1623784A US 1623784 A US1623784 A US 1623784A US 635970 A US635970 A US 635970A US 63597023 A US63597023 A US 63597023A US 1623784 A US1623784 A US 1623784A
- Authority
- US
- United States
- Prior art keywords
- tungsten
- thorium
- copper
- incandescent filament
- filament
- 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 - Lifetime
Links
Classifications
-
- 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
- H01K3/02—Manufacture of incandescent bodies
Definitions
- the present invention relates to a novel refractory metal composition or' alloy com sisting largely of tungsten and containing thorium and copper as-constituents, which 5 is of particular utility as a lighting body in -incandescent lamps.
- Filaments embodying .my invention have a materially lower vapor pressure than an ordinary tungsten filament, and hence may be operated with a higher .10 lighting .efficiency than tungsten with the same average length of life, and if operated at the same elficiency will have a longer life.
- my new incandescent material is not limited to any particular process, I find it convenient to employ .in general the method of Coolidge U.- S. Patent No.
- Thorium and copper may be added to tungsten in an elementary state, or as reducible or decomposable compounds.
- the following examples of tungsten composi; tions containing thorium and copper material will illustrate my invention.
- metallic tungsten may be incorporated by weight 0.5% metallic thorium and-0.25% co per. This mixture is sintered and swage as described in the above Coolidge patent whereby the material is rendered ductile. It is then drawn so into filaments as described in this patent.
- the product when subjected to swa-ging and drawing has normally the'small grain structure characteristic of thoriated tungsten wire, as described in Coolid e Patent No. 3 1,082,933.
- the specific electrical resistance ofthe swaged metal is materially higher than the s ecific resistance of substantially pure meta lic tungsten, thoriated or nonthoriated',--say, in the neighborhood of 10% tungsten.
- the rate of evaporation of tungsten containing thorium and copper is less than 'that of either substantially pure tungsten or tung- Application filed Kay 1, 1923. semi No 635,970.
- Incandescent filaments made in accordance with my invention may be mounted in vacuum lamps or in lamps containing a filling of gas or vapor, as described in Langmuir Patent No. 1,180,159.
- potassium silicate preferably is added to the raw batch-of filament mix, as described in ,Patent No. 1,410,499,- granted to Aladar Pacz, March 21, 1922.
- a composition consisting of tungsten in preponderating amount and containin fractional percentages of thorium an 1 copper.
- a "sintered metal composition consisting in preponderating amount of tungsten and containing by weight about 0.50%
- a filamentary body consisting largely of tungsten and containing associated therewith thorium and copper, said filament having at a given temperature of incandescence a rate of evaporation materially lower than substantially pure tungsten.
- An incandescent lighting body operable at incandescence whlch consists in preponderating amount of tungsten and contains thoriumr and copper in combined amount ofless than one per cent.
- a metal composition consisting of a preponde'rating amount of tungsten and containing suliiciently large amounts of thorium and copper to cause the .electricalresistance 80 to be increased and the rate of evaporation at a given high temperature to be decreased v as compared with tungsten unassociated with I 4 higher. It is substantially as workable as said materials.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Discharge Lamp (AREA)
- Ceramic Products (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL16272D NL16272C (it) | 1923-05-01 | ||
US635970A US1623784A (en) | 1923-05-01 | 1923-05-01 | Incandescent filament |
US635971A US1721383A (en) | 1923-05-01 | 1923-05-01 | Metal composition |
GB10187/24A GB215347A (en) | 1923-05-01 | 1924-04-24 | Improvements in and relating to the manufacture of sintered tungsten and filaments made therefrom |
GB10311/24A GB215348A (en) | 1923-05-01 | 1924-04-25 | A malleable and ductile tungsten composition or alloy suitable for use in the manufacture of lighting bodies or filaments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US635970A US1623784A (en) | 1923-05-01 | 1923-05-01 | Incandescent filament |
Publications (1)
Publication Number | Publication Date |
---|---|
US1623784A true US1623784A (en) | 1927-04-05 |
Family
ID=24549851
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US635970A Expired - Lifetime US1623784A (en) | 1923-05-01 | 1923-05-01 | Incandescent filament |
Country Status (3)
Country | Link |
---|---|
US (1) | US1623784A (it) |
GB (2) | GB215347A (it) |
NL (1) | NL16272C (it) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8619076D0 (en) * | 1986-08-05 | 1986-09-17 | Shell Int Research | Partial oxidation of fuel |
-
0
- NL NL16272D patent/NL16272C/xx active
-
1923
- 1923-05-01 US US635970A patent/US1623784A/en not_active Expired - Lifetime
-
1924
- 1924-04-24 GB GB10187/24A patent/GB215347A/en not_active Expired
- 1924-04-25 GB GB10311/24A patent/GB215348A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB215348A (en) | 1924-10-16 |
NL16272C (it) | |
GB215347A (en) | 1925-09-24 |
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