US3890531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure mercury vapor discharge lamp with amalgam
Assignee: PATENT TREUHAND GES fur ELEKST
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Filing: 1974-06-05
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Granted: 1975-06-17
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Expires: 1994-06-05
Abstract
Abstract An improved low pressure mercury vapor discharge lamp of the fluorescent type wherein a ductile metal is used as the amalgamforming metal. The improvement comprises using as the amalgamforming metal an admixture of a silicon-aluminum alloy or a beryllium-aluminum alloy with said ductile metal. The ductile metal is one with which the said aluminum alloy is not substantially in solid solution at the operating temperature of the lamp. The preferered ductile metal is indium or a ductile indium alloy.
Inventors
- 👤 Ernst Panofski
- 👤 Erhard Rasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:28
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/72
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
IN A MERCURY VAPOR DISCHARGE LAMP OF THE FLUORSECENT TYPE COMPRISING AN ELONGATED TRANSPARENT ENVELOPE HAVING ELECTRODES SEALED INTO ITS ENDS, AT LEAST ONE OF SAID ELECTRODES BEING CONNECTED TO AN ELECTRODE POSITIONING MEANS, SAID ELECTRODE POSITIONING MEANS CONTAINING ON ITS SURFACE AT LEAST ONE DUCTILE METAL COMPOSITION AS THE AMALGAM-FORMING METAL, THE IMPROVEMENT COMPRISING UTILIZING AS SAID DUCTILE METAL COMPOSITION, A DUCTILE AMALGAM-FORMING METAL AND AT LEAST ONE ALUMINUM ALLOY SELECTED FROM THE GROUP CONSISTING OF SILICONALUMINUM AND BERYLLIUM-ALUMINUM, SAID ALUMINUM ALLOY DEING A SEPARATE SOIL PHASE DISPERSED THROUGHOUT SAID DUCTILE AMALGAM-FORMING METAL AT THE OPERATING TEMPERATURE.
Claim 2
Dependent Claim
98 words
IN A MERCURY VAPOR DISCHARGE LAMP OF THE FLUORSECENT TYPE COMPRISING AN ELONGATED TRANSPARENT ENVELOPE HAVING ELECTRODES SEALED INTO ITS ENDS, AT LEAST ONE OF SAID ELECTRODES BEING CONNECTED TO AN ELECTRODE POSITIONING MEANS, SAID ELECTRODE POSITIONING MEANS CONTAINING ON ITS SURFACE AT LEAST ONE DUCTILE METAL COMPOSITION AS THE AMALGAM-FORMING METAL, THE IMPROVEMENT COMPRISING UTILIZING AS SAID DUCTILE METAL COMPOSITION, A DUCTILE AMALGAM-FORMING METAL AND AT LEAST ONE ALUMINUM ALLOY SELECTED FROM THE GROUP CONSISTING OF SILICONALUMINUM AND BERYLLIUM-ALUMINUM, SAID ALUMINUM ALLOY DEING A SEPARATE SOIL PHASE DISPERSED THROUGHOUT SAID DUCTILE AMALGAM-FORMING METAL AT THE OPERATING TEMPERATURE.
Claim 3
Dependent Claim
31 words
The lamp of claim 1, wherein said ductile metal composition contains between about 0.05% and 25% by weight of said aluminum alloy based on the weight of said ductile amalgam-forming metal.
Claim 4
Dependent Claim
59 words
The lamp of claim 2, wherein said ductile amalgam-forming metal is selected from the group consisting of indium and gallium and alloys thereof and wherein when said ductile amalgam-forming metal is an alloy of indium or gallium, the alloying metal or metals form solid solutions with said indium or gallium; and wherein said aluminum alloy is a silicon-aluminum alloy.
Claim 5
Dependent Claim
33 words
The lamp of claim 3, wherein said ductile amalgam-forming metal is indium or an alloy of indium with at least one metal selected from the group consisting of thallium, zinc, bismuth and tin.
Claim 6
Dependent Claim
18 words
The lamp of claim 4, wherein said silicon-aluminum alloy contains between 10% and 20% by weight of silicon.
Claim 7
Dependent Claim
27 words
The lamp of claim 5, wherein said ductile metal composition contains between about 0.5% and 5% by weight of said silicon-aluminum based on the ductile amalgam-forming metal.
Claim 8
Dependent Claim
20 words
The lamp of claim 1, wherein said aluminum alloy is a silicon-aluminum alloy containing between 10% and 20% of silicon.
Claim 9
Dependent Claim
26 words
The lamp of claim 1, wherein said ductile metal composition contains between about 0.5% and 5% of a silicon-aluminum alloy based on the ductile amalgam-forming metal.
Claim 10
Dependent Claim
16 words
The lamp of claim 3, wherein said silicon-aluminum alloy contains between 10% and 20% of silicon.
Claim 11
Dependent Claim
11 words
The lamp of claim 1, wherein said aluminum alloy is beryllium-aluminum.
Claim 12
Dependent Claim
66 words
An electrode support for fluorescent lamps comprising a flare stem and a stem press and containing on at least one portion of its surface a ductile metal composition comprising at least one ductile amalgam-forming metal and at least one aluminum alloy selected from the group consisting of silicon-aluminum and beryllium-aluminum, said aluminum alloy comprising between about 0.05% and 25% by weight of said ductile amalgam-forming metal.
Claim 13
Dependent Claim
66 words
An electrode support for fluorescent lamps comprising a flare stem and a stem press and containing on at least one portion of its surface a ductile metal composition comprising at least one ductile amalgam-forming metal and at least one aluminum alloy selected from the group consisting of silicon-aluminum and beryllium-aluminum, said aluminum alloy comprising between about 0.05% and 25% by weight of said ductile amalgam-forming metal.
Claim 14
Dependent Claim
20 words
The electrode support of claim 11, wherein said ductile metal composition comprises about 98% indium, 1.77% aluminum and 0.23% silicon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |