US4383197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal halide arc discharge lamp having shielded electrode
Assignee: Osram Sylvania Inc
•
Filing: 1978-11-02
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Granted: 1983-05-10
•
Expires: 1998-11-02
Abstract
Abstract A shield is disposed about the electrode of a metal halide arc discharge lamp in order to improve lamp performance. The construction and location of the shield are such as to not lower the cold-spot temperature of the arc tube.
Inventors
- 👤 W. Calvin Gungle
- 👤 William M. Keeffe
- 👤 Dale E. Work
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:54
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A high intensity arc discharge lamp comprising an arc tube having electrodes and containing a fill including a starting gas and a metal halide, and a shield disposed about an electrode having a tip, the construction and location of the shield being such that the cold-spot temperature of the arc tube is not significantly lowered by the presence of said shield, said shield being heated to incandescence during normal lamp operation.
Claim 2
Dependent Claim
71 words
A high intensity arc discharge lamp comprising an arc tube having electrodes and containing a fill including a starting gas and a metal halide, and a shield disposed about an electrode having a tip, the construction and location of the shield being such that the cold-spot temperature of the arc tube is not significantly lowered by the presence of said shield, said shield being heated to incandescence during normal lamp operation.
References Cited (Backward Citations)
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US2725495A
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US2812465A
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US3109952A
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US3764842A
Cited
US3761758A
Cited
US4056751A
Cited
US4056750A
Cited
US4117374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |