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US4237401A
Expired / Lapsed
US
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Low-pressure mercury vapor discharge lamp
Assignee: US Philips Corp
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Filing: 1978-10-18
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Granted: 1980-12-02
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Expires: 1998-10-18
Abstract
Abstract Low-pressure mercury vapor discharge lamp having a discharge vessel comprising at least two thermally emitting electrodes as well as mercury and a rare gas or a combination of rare gases, the discharge vessel being provided with a glass wall permeable to the ultra-violet radiation generated in the mercury discharge, at least a halide of mercury being present in the discharge vessel.
Inventors
- 👤 Winston D. Couwenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:37
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A low-pressure mercury vapor discharge lamp which comprises: a discharge vessel; at least two thermally emitting electrodes, mercury, at least one rare gas, and between 0.005 and 0.05 mg/cm 3 of mercury iodide being disposed in said discharge vessel; and said discharge vessel having a glass wall which is permeable to ultra-violet radiation generated in the mercury discharge.
Claim 2
Dependent Claim
58 words
A low-pressure mercury vapor discharge lamp which comprises: a discharge vessel; at least two thermally emitting electrodes, mercury, at least one rare gas, and between 0.005 and 0.05 mg/cm 3 of mercury iodide being disposed in said discharge vessel; and said discharge vessel having a glass wall which is permeable to ultra-violet radiation generated in the mercury discharge.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |