US3993379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury electrodeless discharge lamp and method of its fabrication
Assignee: Applied Biosystems Inc
•
Filing: 1975-12-22
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Granted: 1976-11-23
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Expires: 1995-12-22
Abstract
Abstract Disclosed is a mercury electrodeless discharge lamp for use in spectrophotometric analysis, particularly atomic absorption spectrophotometry, and a method of its fabrication. Unreduced mercuric oxide (HgO) is employed as the source of mercury in the lamp. In fabricating the lamp, a small quantity of mercuric oxide is introduced into a lamp bulb which has been previously cleansed and flushed with noble gas. The bulb is heated to a temperature just below the decomposition point of the mercuric oxide. The bulb is then flushed with a noble gas, filled to the desired pressure with a noble gas and sealed.
Inventors
- 👤 William J. Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:25
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/044
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A method of fabricating a mercury electrodeless discharge lamp in which unreduced mercuric oxide (HgO) is introduced into the lamp cavity as the source of mercury therein.
Claim 2
Independent Claim
27 words
A method of fabricating a mercury electrodeless discharge lamp in which unreduced mercuric oxide (HgO) is introduced into the lamp cavity as the source of mercury therein.
Claim 3
Independent Claim
84 words
A method of fabricating a mercury electrodeless discharge lamp comprising the steps of: a. providing a radiation transparent lamp bulb; b. cleansing, evacuating and flushing the bulb with a noble gas; c. filling the bulb with noble gas at low pressure; d. introducing a small quantity of mercuric oxide into the bulb; e. heating the bulb indirectly to a temperature below the decomposition point of mercuric oxide; f. filling the bulb to the desired pressure with noble gas; and g. sealing off the bulb.
Claim 4
Independent Claim
84 words
A method of fabricating a mercury electrodeless discharge lamp comprising the steps of: a. providing a radiation transparent lamp bulb; b. cleansing, evacuating and flushing the bulb with a noble gas; c. filling the bulb with noble gas at low pressure; d. introducing a small quantity of mercuric oxide into the bulb; e. heating the bulb indirectly to a temperature below the decomposition point of mercuric oxide; f. filling the bulb to the desired pressure with noble gas; and g. sealing off the bulb.
Claim 5
Dependent Claim
12 words
A method according to claim 2 wherein said noble gas is argon.
Claim 6
Dependent Claim
25 words
As an article of manufacture, a mercury spectral source consisting of an electrodeless discharge lamp containing mercuric oxide and a noble gas at low pressure.
Claim 7
Dependent Claim
25 words
As an article of manufacture, a mercury spectral source consisting of an electrodeless discharge lamp containing mercuric oxide and a noble gas at low pressure.
Claim 8
Dependent Claim
14 words
An article of manufacture according to claim 4 wherein said noble gas is argon.
References Cited (Backward Citations)
US3868525A
Cited
US3787106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |