Patent US4902935A successfully refreshed from Google Patents.
US4902935A
Expired / Lapsed
US
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Method and apparatus for evening out the temperature distribution of electrodeless lamp bulbs
Assignee: LG Electronics Inc
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Filing: 1988-06-29
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Granted: 1990-02-20
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Expires: 2008-06-29
Abstract
Abstract An electrodeless lamp bulb is rotated about an axis which is at a designated angle to the predominant direction of the electrical field. This has the effect of evening out the temperature distribution about the bulb and reducing the formation of hot and cold spots.
Inventors
- 👤 Charles H. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:19
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/044; H01P; H01P5/00; H01P5/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
83 words
In an electrodeless lamp, a method of evening out the temperature distribution of the bulb wall, comprising the steps of, providing an electrodeless lamp including a bulb containing a gaseous fill which is disposed in only one electromagnetic field, which field has an electric field component which is predominantly in a first direction, and rotating the bulb about an axis which is at an angle of between about 30° and about 70° or between about 110° and about 150°, with said first direction.
Claim 2
Dependent Claim
83 words
In an electrodeless lamp, a method of evening out the temperature distribution of the bulb wall, comprising the steps of, providing an electrodeless lamp including a bulb containing a gaseous fill which is disposed in only one electromagnetic field, which field has an electric field component which is predominantly in a first direction, and rotating the bulb about an axis which is at an angle of between about 30° and about 70° or between about 110° and about 150°, with said first direction.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said angle is either between about 40° and about 60° or between about 120° and about 140°.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein the electrodeless lamp further includes a microwave cavity in which said bulb is disposed and wherein said electromagnetic field comprises a microwave field.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein said electromagnetic field is generated by only a single magnetron.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said cavity has only a single coupling slot therein for coupling microwave energy.
Claim 7
Dependent Claim
12 words
The method of claim 2 wherein said bulb is of spherical shape.
Claim 8
Dependent Claim
12 words
The method of claim 3 wherein said bulb is spherical in shape.
Claim 9
Dependent Claim
17 words
The method of claim 2 wherein cooling fluid is impinged on said bulb as it is rotated.
Claim 10
Dependent Claim
17 words
The method of claim 3 wherein cooling fluid is impinged on said bulb as it is rotated.
Claim 11
Dependent Claim
85 words
An electrodeless lamp comprising, a microwave cavity, a bulb containing a gaseous medium disposed in said cavity, means for generating microwave energy, means for coupling said microwave energy to said cavity in such manner that only one electric field is set up in said cavity, which electric field is predominantly in a first direction, and means for rotating said bulb about an axis which is at an angle of between about 30° and about 70° or between about 110° and 150°, with said first direction.
Claim 12
Dependent Claim
85 words
An electrodeless lamp comprising, a microwave cavity, a bulb containing a gaseous medium disposed in said cavity, means for generating microwave energy, means for coupling said microwave energy to said cavity in such manner that only one electric field is set up in said cavity, which electric field is predominantly in a first direction, and means for rotating said bulb about an axis which is at an angle of between about 30° and about 70° or between about 110° and 150°, with said first direction.
Claim 13
Dependent Claim
30 words
The electrodeless lamp of claim 10 wherein said means for generating microwave energy comprises a single magnetron, and said means for coupling comprises a single coupling slot in said cavity.
Claim 14
Dependent Claim
24 words
The electrodeless lamp of claim 11 wherein said angle is either between about 40° and about 60° or between about 120° and about 140°.
Claim 15
Dependent Claim
25 words
The electrodeless lamp of claim 12 wherein said means for rotating the bulb comprises a motor and a stem disposed between the motor and bulb.
Claim 16
Dependent Claim
13 words
The electrodeless lamp of claim 13 wherein the cavity is spherical in shape.
Claim 17
Dependent Claim
13 words
The electrodeless lamp of claim 13 wherein the cavity is cylindrical in shape.
Claim 18
Dependent Claim
13 words
The electrodeless lamp of claim 12 wherein the bulb is spherical in shape.
Claim 19
Dependent Claim
13 words
The electrodeless lamp of claim 15 wherein the bulb is spherical in shape.
Claim 20
Dependent Claim
20 words
The electrodeless lamp of claim 12 further including means for impinging cooling fluid on said bulb as it is rotated.
Claim 21
Dependent Claim
20 words
The electrodeless lamp of claim 16 further including means for impinging cooling fluid on said bulb as it is rotated.
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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |