US5109181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure mercury vapor discharge lamp
Assignee: US Philips Corp
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Filing: 1989-04-17
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Granted: 1992-04-28
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Expires: 2009-04-17
Abstract
Abstract A high-pressure mercury vapor discharge lamp whose envelope two tungsten electrodes disposed therein of tungsten and a filling containing a rare gas, a quantity of mercury larger than 0.2 mg/mm 3 at a mercury a pour pressure of more than 200 bar and at least one of the halogens chlorine, bromine or iodine in a quantity between 10 -6 and 10 -4 μmol/mm 3 . The wall load in operation is higher than 1 W/mm 2 .
Inventors
- 👤 Hanns E. Fischer
- 👤 Horst Horster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/82
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A high-pressure mercury vapor discharge lamp comprising a discharge envelope, a pair of discharge electrodes comprising tungsten between which a discharge is maintained during lamp operation, and a filling essentially consisting of mercury, a rare gas, and a halogen for maintaining a tungsten transport cycle during lamp operation, characterized in that: the quantity of mercury is larger than 0.2 mg/mm 3 , during lamp operation the mercury vapor pressure is higher than 200 bar and the wall load is higher than 1 W/mm 2 , and in that at least one of the halogens Cl, Br or I is present in a quantity between 10 -6 and 10 -4 μmol/mm 3 .
Claim 2
Dependent Claim
112 words
A high-pressure mercury vapor discharge lamp comprising a discharge envelope, a pair of discharge electrodes comprising tungsten between which a discharge is maintained during lamp operation, and a filling essentially consisting of mercury, a rare gas, and a halogen for maintaining a tungsten transport cycle during lamp operation, characterized in that: the quantity of mercury is larger than 0.2 mg/mm 3 , during lamp operation the mercury vapor pressure is higher than 200 bar and the wall load is higher than 1 W/mm 2 , and in that at least one of the halogens Cl, Br or I is present in a quantity between 10 -6 and 10 -4 μmol/mm 3 .
Claim 3
Dependent Claim
36 words
A discharge lamp as claimed in claim 1, characterized in that the quantity of mercury lies between 0.2 and 0.35 mg/mm 3 and the mercury vapor pressure during lamp operation lies between 200 and 350 bar.
Claim 4
Dependent Claim
20 words
A discharge lamp as claimed in claim 2 characterized in that it is surrounded by a filter blocking blue radiation.
Claim 5
Dependent Claim
20 words
A discharge lamp as claimed in claim 1, characterized in that it is surrounded by a filter blocking blue radiation.
Claim 6
Dependent Claim
19 words
A discharge lamp as claimed in claim 1, characterized in that the mercury vapor pressure is about 400 bar.
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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |