US3867665A
Expired / Lapsed
US
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Mercury discharge lamp comprising magnesium halide
Assignee: EMI Group Ltd
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Filing: 1973-11-21
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Granted: 1975-02-18
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Expires: 1993-11-21
Abstract
Abstract A mercury vapour discharge lamp primarily for producing ultraviolet radiation has an atmosphere which in addition to mercury vapour and an inert gas filling for starting an electron discharge, includes magnesium in the form of a halide. The mercury concentraiton is below 0.5 mg/cc of lamp volume, and the magnesium to mercury weight ratio is between 0.002:1 and 0.1:1. The magnesium is introduced into the lamp as magnesium metal together with another metal halide, preferably a mercuric halide.
Inventors
- 👤 Kenneth Frederick Furmidge
- 👤 Eric John George Beeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:01
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
36 words
AN ULTRA-VIOLET EMITTING MERCURY VAPOUR DISCHARGE LAMP, COMPRISING: AN ULTRA-VIOLET TRANSMITTING LAMP ENVELOP; A DISCHARGE ELECTRODE SYSTEM WITHIN SAID ENVELOPE; AND AN ATMOSPHERE WITHING SAID ENVELOPE, SAID ATMOSPHERE COMPRISING MERCURY VAPOUR AND MAGNESIUM VAPOUR IN THE
Claim 2
Dependent Claim
36 words
AN ULTRA-VIOLET EMITTING MERCURY VAPOUR DISCHARGE LAMP, COMPRISING: AN ULTRA-VIOLET TRANSMITTING LAMP ENVELOP; A DISCHARGE ELECTRODE SYSTEM WITHIN SAID ENVELOPE; AND AN ATMOSPHERE WITHING SAID ENVELOPE, SAID ATMOSPHERE COMPRISING MERCURY VAPOUR AND MAGNESIUM VAPOUR IN THE
Claim 3
Dependent Claim
17 words
A lamp as claimed in claim 1, in which said other metal halide is a mercuric halide.
Claim 4
Dependent Claim
26 words
A lamp as claimed in claim 2, in which the weight of mercury in said envelope is below about 0.5 mg per cc of envelope volume.
Claim 5
Dependent Claim
16 words
A lamp as claimed in claim 1, in which said other metal halide is mercuric iodide.
Claim 6
Dependent Claim
24 words
A lamp as claimed in claim 1, in which the ratio by weight of magnesium to mercury is within the range 0.002:1 and 0.1:1.
Claim 7
Dependent Claim
26 words
A lamp as claimed in claim 5, in which the weight of mercury in said envelope is below about 0.5 mg per cc of envelope volume.
Claim 8
Dependent Claim
23 words
A lamp as claimed in claim 1, in which the mercury pressure within said lamp is between about 1/4 and about 1 atmospheres.
Claim 9
Dependent Claim
27 words
A lamp as claimed in claim 1, in which the weight of mercury in said envelope is less than about 0.5 mg per cc of envelope volume.
Claim 10
Dependent Claim
48 words
A lamp as claimed in claim 1, said lamp further having a phosphor-coated outer envelope for emitting visible radiation, and in which said atmosphere in said lamp further comprises trace additions of a halide of at least one of the metals in the group comprising gallium and thallium.
Claim 11
Dependent Claim
54 words
A lamp as claimed in claim 1, said lamp further having a phosphor-coated outer envelope for emitting visible radiation, and in which said atmosphere in said lamp further comprises trace additions of a halide of at least one of the metals in the group comprising aluminium, tin, iron, zinc, yttrium, chromium, bismuth and cadmium.
Claim 12
Dependent Claim
82 words
An ultra-violet emitting mercury vapour discharge lamp, comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; and an atmosphere within said envelope, said atmosphere comprising mercury vapour and magnesium vapour in the form of a magnesium halide in such proportions as to provide enhanced ultra-violet emission, and an inert gas filling to initiate electron discharge, the ratio by weight of magnesium to mercury being within the range 0.002:1 and 0.1:1; whereby an enhanced broadband ultra-violet spectrum is obtained.
Claim 13
Dependent Claim
82 words
An ultra-violet emitting mercury vapour discharge lamp, comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; and an atmosphere within said envelope, said atmosphere comprising mercury vapour and magnesium vapour in the form of a magnesium halide in such proportions as to provide enhanced ultra-violet emission, and an inert gas filling to initiate electron discharge, the ratio by weight of magnesium to mercury being within the range 0.002:1 and 0.1:1; whereby an enhanced broadband ultra-violet spectrum is obtained.
Claim 14
Dependent Claim
23 words
A lamp as claimed in claim 11, in which the mercury pressure within said lamp is between about 1/4 and about 1 atmospheres.
Claim 15
Dependent Claim
27 words
A lamp as claimed in claim 11, in which the weight of mercury within said envelope is less than about 0.5 mg per cc of envelope volume.
Claim 16
Dependent Claim
35 words
A lamp as claimed in claim 11, said lamp further having a phosphor-coated outer envelope for emitting visible radiation, and in which said atmosphere in said lamp further comprises trace additions of another metal halide.
Claim 17
Dependent Claim
75 words
An ultra-violet emitting mercury vapour discharge lamp, comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; and an atmosphere within said envelope, said atmosphere comprising mercury vapour, magnesium vapour in the form of a magnesium halide, and an inert gas filling to initiate electron discharge, the ratio by weight of magnesium to mercury being within the range of about 0.02:1 to about 0.05:1; whereby an enhanced broadband ultra-violet spectrum is obtained.
Claim 18
Dependent Claim
75 words
An ultra-violet emitting mercury vapour discharge lamp, comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; and an atmosphere within said envelope, said atmosphere comprising mercury vapour, magnesium vapour in the form of a magnesium halide, and an inert gas filling to initiate electron discharge, the ratio by weight of magnesium to mercury being within the range of about 0.02:1 to about 0.05:1; whereby an enhanced broadband ultra-violet spectrum is obtained.
Claim 19
Dependent Claim
23 words
A lamp as claimed in claim 15, in which the mercury pressure within said lamp is between about 1/4 and about 1 atmospheres.
Claim 20
Dependent Claim
27 words
A lamp as claimed in claim 15, in which the weight of mercury within said envelope is less than about 0.5 mg per cc of envelope Volume.
Claim 21
Dependent Claim
35 words
A lamp as claimed in claim 15, said lamp further having a phosphor-coated outer envelope for emitting visible radiation, and in which said atmosphere in said lamp further comprises trace additions of another metal halide.
Claim 22
Dependent Claim
74 words
An ultra-violet emitting mercury vapour discharge lamp, comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; and an atmosphere within said envelope, said atmosphere comprising mercury vapour, magnesium vapour in the form of a magnesium halide, and an inert gas filling to initiate electron discharge, the weight of mercury in said envelope being less than 0.5 mg per cc of envelope volume; whereby an enhanced broadband ultra-violet spectrum is obtained.
Claim 23
Dependent Claim
74 words
An ultra-violet emitting mercury vapour discharge lamp, comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; and an atmosphere within said envelope, said atmosphere comprising mercury vapour, magnesium vapour in the form of a magnesium halide, and an inert gas filling to initiate electron discharge, the weight of mercury in said envelope being less than 0.5 mg per cc of envelope volume; whereby an enhanced broadband ultra-violet spectrum is obtained.
Claim 24
Dependent Claim
24 words
A lamp as claimed in claim 19, in which the ratio by weight of magnesium to mercury is within the range 0.002:1 and 0.1:1.
Claim 25
Dependent Claim
23 words
A lamp as claimed in claim 19, in which the mercury pressure within said lamp is between about 1/4 and about 1 atmospheres.
Claim 26
Dependent Claim
48 words
A lamp as claimed in claim 19, said lamp further having a phosphor-coated outer envelope for emitting visible radiation, and in which said atmosphere in said lamp further comprises trace additions of a halide of at least one of the metals in the group comprising gallium and thallium.
Claim 27
Dependent Claim
54 words
A lamp as claimed in claim 19, said lamp further having a phosphor-coated outer envelope for emitting visible radiation, and in which said atmosphere in said lamp further comprises trace additions of a halide of at least one of the metals in the group comprising aluminium, tin, iron, zinc, yttrium, chromium, bismuth and cadmium.
Claim 28
Dependent Claim
23 words
A lamp as claimed in claim 19, in which the magnesium is introduced into said lamp as magnesium metal together with mercuric iodide.
Claim 29
Dependent Claim
39 words
A lamp as claimed in claim 24, in which the ratio by weight of magnesium to mercury is within the range 0.02:1 and 0.05:1, and the mercury pressure within said lamp is between about 1/4 and about 1 atmospheres.
Claim 30
Dependent Claim
28 words
A lamp as claimed in claim 25, in which the lamp fill comprises about 18 parts by weight of mercury, about 0.5 parts by weight of mercuric iodide.
Claim 31
Dependent Claim
61 words
A mercury vapour discharge lamp comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; an atmosphere within said envelope, said atmosphere comprising mercury vapour, magnesium vapour in the form of a magnesium halide, an inert gas filling to initiate electron discharge, and trace additions of another metal halide; and a phosphor-coated outer envelope for emitting visible radiation.
Claim 32
Dependent Claim
61 words
A mercury vapour discharge lamp comprising: an ultra-violet transmitting lamp envelope; a discharge electrode system within said envelope; an atmosphere within said envelope, said atmosphere comprising mercury vapour, magnesium vapour in the form of a magnesium halide, an inert gas filling to initiate electron discharge, and trace additions of another metal halide; and a phosphor-coated outer envelope for emitting visible radiation.
Claim 33
Dependent Claim
21 words
A lamp as claimed in claim 27, wherein said mercury vapour is at a pressure of about 1/4 to 1 atmospheres.
Claim 34
Dependent Claim
29 words
A lamp as claimed in claim 27, wherein said another metal halide comprises a halide of at least one of the metals in the group comprising gallium and thallium.
Claim 35
Dependent Claim
35 words
A lamp as claimed in claim 27, wherein said another metal halide comprises a halide of at least one of the metals in the group comprising aluminum tin, iron, zinc, yttrium, chromium, bismuth and cadmium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |