US4053805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc discharge lamp comprising mercury, scandium and lithium iodide, scandium emission being suppressed
Assignee: GTE Sylvania Inc
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Filing: 1974-12-09
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Granted: 1977-10-11
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Expires: 1994-12-09
Abstract
Abstract A metal halide arc discharge lamp has a fill including lithium iodide, mercury and scandium. In order to maintain a high efficiency in the red emission of the lamp, the ratio of lithium iodide to scandium must be between about 1.67 and 83.3.
Inventors
- 👤 John A. Scholz
- 👤 Phillip J. Gardner
- 👤 H. Graham Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:16
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A red emitting metal halide arc discharge lamp comprising an arc tube having sealed ends and electrodes disposed in said ends and a fill within said arc tube comprising mercury, scandium and lithium iodide, the relationship between the scandium and the lithium iodide being such that lithium is the primary light emitting metal and scandium emission is suppressed.
Claim 2
Dependent Claim
58 words
A red emitting metal halide arc discharge lamp comprising an arc tube having sealed ends and electrodes disposed in said ends and a fill within said arc tube comprising mercury, scandium and lithium iodide, the relationship between the scandium and the lithium iodide being such that lithium is the primary light emitting metal and scandium emission is suppressed.
References Cited (Backward Citations)
US2615140A
Cited
FR1367267A
Cited
US3351798A
Cited
US3398312A
Cited
US3407327A
Cited
US3911308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |