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Patent US4536675A successfully refreshed from Google Patents.
US4536675A
Expired / Lapsed
US
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Electrodeless gas discharge lamp having heat conductor disposed within magnetic core
Assignee: US Philips Corp
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Filing: 1982-08-18
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Granted: 1985-08-20
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Expires: 2002-08-18
Abstract
Abstract Electrodeless gas discharge lamp having a lamp vessel which is closed in a vacuum-tight manner, the lamp comprising a rod-shaped core of a magnetic material, a member of a heat-conducting material (for example copper) extending at or near the axis of the core, heat generated in the core during operation of the lamp being discharged to the environment of the lamp by the member.
Inventors
- 👤 Pieter Postma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:48
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
An electrodeless gas discharge lamp having a lamp vessel which is closed in a vacuum-tight manner and is filled with a metal vapor and a rare gas, the lamp comprising a core of a magnetic material in which a radio frequency magnetic field is induceable by means of an electric power supply unit, an electric field being generated in the lamp vessel, the magnetic material core incorporating a member which is disposed within and is in contact with the core and consists of a heat-conducting material for discharging the heat generated during operation of the lamp to the environment of the lamp, characterized in that the core is in the form of a rod, the member extending along at least the major portion of the core length at least at or near the longitudinal axis of the core.
Claim 2
Dependent Claim
138 words
An electrodeless gas discharge lamp having a lamp vessel which is closed in a vacuum-tight manner and is filled with a metal vapor and a rare gas, the lamp comprising a core of a magnetic material in which a radio frequency magnetic field is induceable by means of an electric power supply unit, an electric field being generated in the lamp vessel, the magnetic material core incorporating a member which is disposed within and is in contact with the core and consists of a heat-conducting material for discharging the heat generated during operation of the lamp to the environment of the lamp, characterized in that the core is in the form of a rod, the member extending along at least the major portion of the core length at least at or near the longitudinal axis of the core.
Claim 3
Dependent Claim
17 words
An electrodeless gas discharge lamp as claimed in claim 1, characterized in that the member is rod-shaped.
Claim 4
Dependent Claim
20 words
An electrodeless gas discharge lamp as claimed in claim 1, characterized in that the member comprises at least one plate.
Claim 5
Dependent Claim
40 words
An electrodeless gas discharge lamp as claimed in claim 1, 2 or 3, characterized in that the member is connected to a metal jacket incorporating the electric power supply unit, the jacket extending to the exterior side of the lamp.
Claim 6
Dependent Claim
20 words
An electrodeless gas discharge lamp as claimed in claim 1, 2, or 3 characterized in that the member contains copper.
Claim 7
Dependent Claim
17 words
An electrodeless gas discharge lamp as claimed in claim 4, characterized in that the member contains copper.
References Cited (Backward Citations)
US4119889A
Cited
US4298828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |