US3958145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure, mercury vapor, metal halide discharge lamp
Assignee: US Philips Corp
•
Filing: 1974-02-14
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Granted: 1976-05-18
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Expires: 1994-02-14
Abstract
Abstract A high pressure mercury vapour discharge lamp having a discharge vessel provided with electrodes between which the discharge is maintained during operation and comprising a quantity of rare gas as a starting gas and furthermore between 0.5 and 25 mg of mercury and between 1 and 20 μg mol of at least one of the halides of tin (with the exception of fluoride) per cubic cm of contents of the discharge vessel. To decrease the colour temperature of the radiation emitted by the lamp the discharge vessel is furthermore provided with at least one of the halides of lithium (with the exception of fluoride), while up to a maximum of 50 mol % of lithium halide may be replaced by sodium halide.
Inventors
- 👤 Alexander Gray Jack
- 👤 Wiggert Kroontje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A high pressure mercury vapour discharge lamp having a discharge vessel provided with electrodes between which the discharge is maintained during operation and comprising a quantity of rare gas as a starting gas and furthermore between 0.5 and 25 mg of mercury and between 1 and 30 μg mol of at least one of the halides of tin per cubic cm of contents of the discharge vessel, wherein the contents of the discharge vessel comprises at least one of the halides of lithium.
Claim 2
Dependent Claim
83 words
A high pressure mercury vapour discharge lamp having a discharge vessel provided with electrodes between which the discharge is maintained during operation and comprising a quantity of rare gas as a starting gas and furthermore between 0.5 and 25 mg of mercury and between 1 and 30 μg mol of at least one of the halides of tin per cubic cm of contents of the discharge vessel, wherein the contents of the discharge vessel comprises at least one of the halides of lithium.
Claim 3
Dependent Claim
41 words
A high pressure mercury vapour discharge lamp as claimed in claim 1, the wherein said lithium bound halogens have an atomic number which is smaller than or equal to the atomic number of the tin-bound halogen having the lowest atomic number.
Claim 4
Dependent Claim
73 words
A high pressure mercury vapour discharge lamp as claimed in claim 2, which lamp comprises tin chloride, tin iodide in which the halogen-tin ratio has a value of between 0.1 and 2.5 and the chlorine-iodine ratio has a value of between 0.25 and 4, wherein the contents of said discharge vessel comprises lithium chloride in a quantity of between 0.1 and 20 μg mol per cubic cm of contents of the discharge vessel.
Claim 5
Dependent Claim
16 words
A lamp as described in claim 3 further incuding an excess of tin in said vessel.
Claim 6
Dependent Claim
78 words
A high pressure mercury vapour discharge lamp as claimed in claim 2, which lamp comprises tin bromide, tin iodide in which the halogen-tin ratio has a value of between 0.1 and 2.5 and the bromine-iodine ratio has a value of between 0.1 and 5, characterized in that the contents of said discharge vessel comprises lithium chloride and/or lithium bromide in a quantity of between 0.1 and 20 μg mol per cubic cm of contents of the discharge vessel.
Claim 7
Dependent Claim
16 words
A lamp as described in claim 5 further including an excess of tin in said vessel.
Claim 8
Dependent Claim
31 words
A lamp as described in claim 1 wherein said discharge vessel contents further include a sodium halide in a molar quantity not more than the molar quantity of said lithium halide.
Claim 9
Dependent Claim
41 words
A high pressure mercury vapour discharge lamp as claimed in claim 7 wherein said lithium and sodium-bound halogens have an atomic number which is smaller than or equal to the atomic number of the tin-bound halogen having the lowest atomic number.
Claim 10
Dependent Claim
77 words
A high pressure mercury vapour discharge lamp as claimed in claim 8, said discharge vessel contents comprising tin chloride and tin iodide in which the halogen-tin ratio has a value of between 0.1 and 2.5 and the chlorine-iodine ratio has a value of between 0.25 and 4, wherein the contents of said discharge vessel comprises lithium chloride in a quantity of between 0.1 and 20 μg mol per cubic cm of said contents of the discharge vessel.
Claim 11
Dependent Claim
17 words
The lamp as claimed in claim 9 wherein said discharge vessel contents comprises an excess of tin.
Claim 12
Dependent Claim
75 words
A high pressure mercury vapour discharge lamp as claimed in claim 7, which lamp comprises tin bromide and tin iodide in which the halogen-tin ratio has a value of between 0.1 and 5, wherein the contents of said discharge vessel comprises one or more ingredients selected from the group consisting of lithium chloride and lithium bromide in a quantity of between 0.1 and 20 μg mole per cubic cm of contents of the discharge vessel.
Claim 13
Dependent Claim
19 words
The lamp as described in claim 11 wherein the contents of said vessel further includes an excess of tin.
References Cited (Backward Citations)
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US3431447A
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US3566178A
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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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |