US3821585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten halogen incandescent lamp with group iva metal getter and method of manufacture
Assignee: Philips North America LLC
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Filing: 1973-04-30
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Granted: 1974-06-28
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Expires: 1993-04-30
Abstract
Abstract An incandescent lamp having a tungsten filament is dosed with a small carefully-controlled quantity of iodine or bromine gas and concurrently purged of water, oxygen, hydrogen, carbon monoxide and carbon dioxide by placing a selected amount of hafnium iodide, titanium iodide, or zirconium iodide (or bromides of such metals) within the envelope during lamp manufacture. The additive material, upon being heated by the filament when the latter is first energized, volatilizes and releases iodine (or bromine) gas and provides free hafnium, titanium or zirconium (Groups IVA metals) within the finished lamp which serves as a getter and eliminates the water cycle. The desired halogen-dosing and gettering action can also be achieved by forming a composite consisting of a thermally-decomposable halide which is disposed in a matrix of the getter-metal (or an alloy thereof) and placing it inside the envelope in heat-receptive relationship with the filament. A getter-metal (or alloy) component that is precharged with iodine or bromine gas and releases the latter when heated can also be employed.
Inventors
- 👤 S Jansson
- 👤 E Gulbransen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
34 words
The incandescent lamp of claim 1 wherein said halogen-releasing and impurity-purging material comprises a thermally-decomposable compound selected from the group consisting of the di-, tri-, and tetra-iodides and bromides of hafnium, titanium and zirconium.
Claim 2
Dependent Claim
46 words
The incandescent lamp of claim 1 wherein said halogen-releasing and impurity-purging material consists essentially of a body of zirconium, titanium, or hafnium that is precharged with iodine or bromine gas and releases at least some of the latter when it is heated by the energized filament.
Claim 3
Dependent Claim
31 words
The incandescent lamp of claim 1 wherein said halogen-releasing and impurity-purging material comprises a thermally-decomposable halide compound that is disposed in a matrix that consists essentially of zirconium, titanium or hafnium.
Claim 4
Dependent Claim
26 words
The incandescent lamp of claim 4 wherein said halide compound is selected from the group consisting of a bromide or iodide of hafnium, titanium or zirconium.
Claim 5
Dependent Claim
140 words
The incandescent lamp of claim 2 wherein: said filament comprises a coil of tungsten wire, said envelope is composed of soft glass and has a sealed end portion, said lead-in conductors extend from said sealed end portion and are connected to a base member attached to said end portion and said lamp is thus of the single-ended type, said inert gas fill comprisea a gas selected from the group consisting of nitrogen, argon, krypton and mixtures thereof at a pressure of from about 600 to 1,000 torr, and said halogen-releasing and impurity-purging compound, after being heated by the energized filament, doses the lamp atmosphere with from 0.005 to 0.05 micromole of iodine or bromine per cubic centimeter of envelope volume and provides a quantity of zirconium, hafnium or titanium within the envelope that is sufficient to inhibit the water cycle.
Claim 6
Dependent Claim
29 words
The single ended incandescent lamp of claim 6 wherein said envelope is composed of soda-lime glass and said lamp has a nominal rating of from 40 to 300 watts.
Claim 7
Dependent Claim
137 words
The incandescent lamp of claim 2 wherein; said envelope is of tubular configuration and composed of quartz, said filament comprises a coil of tungsten wire that is longitudinally supported within said envelope, said lead-in conductors extend through seals at the respective ends of said envelope and the lamp is thus of the double-ended variety, said inert fill gas comprises a gas selected from the group consisting of nitrogen, argon, krypton, xenon and mixtures thereof at a pressure of from about 500 to 2,000 torr, and said halogen-releasing and impurity-purging compound, after being heated by the energized filament, doses the lamp atmosphere with from 0.02 to 0.07 micromole of iodine or bromine per cubic centimeter of envelope volume and provides a quantity of zirconium, hafnium or titanium within the envelope that is sufficient to inhibit the water cycle.
Claim 8
Dependent Claim
38 words
The incandescent lamp of claim 2 wherein said halogen-releasing and impurity-pUrging compound comprises a predetermined quantity of a tetraiodide or a tetrabromide of Hf, Ti or Zr that is disposed on at least one of said lead-in conductors.
Claim 9
Independent Claim
110 words
The method of dosing an electric incandescent lamp with a predetermined amount of bromine or iodine gas and concurrently purging oxygen, hydrogen, water, carbon monoxide and carbon dioxide from the lamp atmosphere, which method comprises; placing a quantity of a getter-halide material consisting essentially of a compound selected from the group consisting of a compound selected from the group consisting of the di-, tri-, and tetra-iodides and bromides of hafnium, titanium and zirconium within the lamp envelope in heat-receptive proximity with the lamp filament during the fabrication of the lamp, evacuating and hermetically sealing said envelope, and then energizing said filament and thereby effecting the thermal decomposition of said compound.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |