US4645967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeless low-pressure gas discharge lamp
Assignee: US Philips Corp
•
Filing: 1985-02-05
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Granted: 1987-02-24
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Expires: 2005-02-05
Abstract
Abstract An electrodeless low-pressure gas discharge lamp includes a glass lamp vessel (1) which is provided with a sealing member (6) connected to the wall of the lamp vessel by means of a suitable sealing material, and which has on its inner wall a conductive layer (7), at least part of which is transparent, that extends beyond the connection to the sealing member (6), the member being slightly recessed into the lamp vessel. The inner conductive layer can thus be connected in a simple manner to an electrical conductor, which during operation of the lamp is connected, for example, to one of the supply wires of the mains.
Inventors
- 👤 Anton J. Bouman
- 👤 Heiner Kostlin
- 👤 Wiggert Kroontje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:40
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
An electrodeless low-pressure gas discharge lamp comprising a glass lamp vessel which is provided with a sealing member connected by means of sealing material to the wall of the lamp vessel in a vacuum-tight manner, which lamp includes a core of magnetic material having arranged therearound a winding connected to an electrical supply unit for producing a high frequency magnetic and electric field within the lamp vessel, the inner wall of the lamp vessel being provided with a transparent electrically conducting layer which is electrically connected by means of a lead-through conductor to a conductor located outside the lamp vessel, characterized in that the sealing member is slightly recessed into the lamp vessel, the lead-through conductor being an electrically conducting layer which is located on the inner wall of the lamp vessel and extends as far as a wall portion of the lamp vessel located outside the sealing member.
Claim 2
Dependent Claim
149 words
An electrodeless low-pressure gas discharge lamp comprising a glass lamp vessel which is provided with a sealing member connected by means of sealing material to the wall of the lamp vessel in a vacuum-tight manner, which lamp includes a core of magnetic material having arranged therearound a winding connected to an electrical supply unit for producing a high frequency magnetic and electric field within the lamp vessel, the inner wall of the lamp vessel being provided with a transparent electrically conducting layer which is electrically connected by means of a lead-through conductor to a conductor located outside the lamp vessel, characterized in that the sealing member is slightly recessed into the lamp vessel, the lead-through conductor being an electrically conducting layer which is located on the inner wall of the lamp vessel and extends as far as a wall portion of the lamp vessel located outside the sealing member.
Claim 3
Dependent Claim
28 words
An electrodeless low-pressure gas discharge lamp as claimed in claim 1, characterized in that the lead-through conductor and the transparent conductive layer in the lamp vessel are integral.
Claim 4
Dependent Claim
23 words
An electrodeless low-pressure gas discharge lamp as claimed in claim 2, characterized in that the transparent conductive layer consists of fluorine-doped tin oxide.
References Cited (Backward Citations)
US2159812A
Cited
US2799421A
Cited
US4119889A
Cited
JPS534381A
Cited
JPS534379A
Cited
JPS53137577A
Cited
US4171503A
Cited
US4568859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |