Patent US5003233A successfully refreshed from Google Patents.
US5003233A
Expired / Lapsed
US
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Radio frequency powered large scale display
Assignee: Osram Sylvania Inc
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Filing: 1989-01-03
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Granted: 1991-03-26
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Expires: 2009-01-03
Abstract
Abstract A large scale video display has a plurality of colored electrodeless lamps which are excited by RF energy coupled from a RF cavity upon which the lamps are mounted. The lamps are easily replaced and do not degrade as fast as conventional lamps which have electrodes.
Inventors
- 👤 Joseph M. Proud
- 👤 Walter P. Lapatovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:51
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/313; H; H01; H01J; H01J65/00; H01J65/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
79 words
A video display comprising: a RF cavity defined by a RF reflective back wall and a RF reflective front wall, said front wall spaced from said back wall by RF reflective side walls; a plurality of electrodeless lamps arranged in proximity to said front wall, external to said RF cavity; RF means for providing RF energy in said RF cavity; and coupling means corresponding to each lamp for coupling RF energy from said RF cavity to the corresponding lamp.
Claim 2
Dependent Claim
79 words
A video display comprising: a RF cavity defined by a RF reflective back wall and a RF reflective front wall, said front wall spaced from said back wall by RF reflective side walls; a plurality of electrodeless lamps arranged in proximity to said front wall, external to said RF cavity; RF means for providing RF energy in said RF cavity; and coupling means corresponding to each lamp for coupling RF energy from said RF cavity to the corresponding lamp.
Claim 3
Dependent Claim
22 words
The display of claim 1 wherein each lamp has a cylindrical configuration and has an axis arranged orthogonal to said front wall.
Claim 4
Dependent Claim
44 words
The display of claim 2 which includes a cylindrical sheath corresponding to each lamp, each cylindrical sheath extending orthogonal to said front wall and in electrical connection to said front wall, and covering at least part of the cylindrical side of the corresponding lamp.
Claim 5
Dependent Claim
14 words
The display of claim 3 wherein the inner surface of said sheath is reflective.
Claim 6
Dependent Claim
28 words
The display of claim 3 wherein each lamp has a reentrant cavity and the corresponding coupling means includes a conductive member arranged to fit inside said reentrant cavity.
Claim 7
Dependent Claim
19 words
The display of claim 5 wherein each of said coupling means includes a probe arranged inside said RF cavity.
Claim 8
Dependent Claim
19 words
The display of claim 6 wherein each of said coupling means includes a loop arranged inside said RF cavity.
Claim 9
Dependent Claim
31 words
The display of claim 3 wherein each lamp has a first end in proximity to said front wall, and the corresponding coupling means includes a circular member arranged about said end.
Claim 10
Dependent Claim
19 words
The display of claim 8 wherein each of said coupling means includes a probe arranged inside said RF cavity.
Claim 11
Dependent Claim
19 words
The display of claim 9 wherein each of said coupling means includes a loop arranged inside said RF cavity.
Claim 12
Dependent Claim
18 words
The display of claim 1 wherein said lamps are arranged in groups of three in a triangular pattern.
Claim 13
Dependent Claim
14 words
The display of claim 1 wherein said lamps are arranged in a rectangular pattern.
Claim 14
Dependent Claim
23 words
The display of claim 1 which includes a variable impedance device arranged in shunt between a corresponding coupling means and the front wall.
Claim 15
Dependent Claim
14 words
The display of claim 13 wherein said variable impedance device is a PIN diode.
Claim 16
Dependent Claim
13 words
The display of claim 13 wherein said variable impedance device is a varactor.
Claim 17
Dependent Claim
22 words
The display of claim 1 which includes a variable impedance device arranged in series with a lamp and the corresponding coupling means.
Claim 18
Dependent Claim
14 words
The display of claim 16 wherein said variable impedance device is a PIN diode.
Claim 19
Dependent Claim
13 words
The display of claim 16 wherein said variable impedance device is a varactor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |