US4636686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury vapor discharge lamp provided with an amalgam forming alloy
Assignee: US Philips Corp
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Filing: 1985-02-26
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Granted: 1987-01-13
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Expires: 2005-02-26
Abstract
Abstract A low-pressure mercury vapor discharge lamp comprising a discharge vessel (2) which is sealed in a vacuum-tight manner and in which during operation of the lamp a discharge is present, while this discharge vessel contains a small quantity of an alloy (11) which forms with mercury an amalgam, which alloy is composed of bismuth, lead and silver.
Inventors
- 👤 Wubbe Vrieze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:02
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/72; H01J61/02; H01J61/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A low-pressure mercury vapor discharge lamp comprising a discharge vessel which is sealed in a vacuum-tight manner and in which during operation of said lamp a discharge is present; and said discharge vessel contains a small quantity of an alloy which forms with mercury an amalgam, characterized in that the alloy is composed of bismuth, lead and silver.
Claim 2
Dependent Claim
58 words
A low-pressure mercury vapor discharge lamp comprising a discharge vessel which is sealed in a vacuum-tight manner and in which during operation of said lamp a discharge is present; and said discharge vessel contains a small quantity of an alloy which forms with mercury an amalgam, characterized in that the alloy is composed of bismuth, lead and silver.
Claim 3
Dependent Claim
41 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1, characterized in that the ratio of the sum of the number of atoms of bismuth, lead and silver to the number of atoms of mercury lies between 94:6 and 99:1.
Claim 4
Dependent Claim
82 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1, characterized in that the mutual ratio of the numbers of atoms of bismuth, lead and silver lies in the quadrangle ABCD of the ternary diagram Bi Pb-Ag with A: 93% of Bi, 2% of Pb, 5% of Ag; B: 35% of Bi, 60% of Pb and 5% of Ag; C: 35% of Bi, 35% of Pb, 30% of Ag; D: 68% of Bi, 2% of Pb, 30% of Ag (at. %).
Claim 5
Dependent Claim
42 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1, characterized in that the ratio of the number of atoms of bismuth to the number of atoms of lead to the number of atoms of silver lies near the ratio 63:22:15.
Claim 6
Dependent Claim
27 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1, characterized in that the amalgam-forming alloy is present on the inner wall of the exhaust tube.
References Cited (Backward Citations)
US3263111A
Cited
US4093889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |