US5070273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury vapor discharge lamp with flat discharge vessel and external side electrodes
Assignee: US Philips Corp
•
Filing: 1989-02-08
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Granted: 1991-12-03
•
Expires: 2009-02-08
Abstract
Abstract Low-pressure mercury vapor discharge lamp having a discharge vessel filled with mercury and a rare gas, which discharge vessel comprises two substantially parallel, mainly rectangular flat glass plates located at a relatively short distance from each other and being transparent to light, which plates are connected together in a gas-tight manner proximate their circumference and form upright walls. Electrodes, between which a discharge is maintained in the discharge vessel during operation arranged on the outer side of the discharge vessel. The electrodes are in the form of strips of conducting material which are arranged on at least two facing upright walls and which extend substantially throughout the length of these walls.
Inventors
- 👤 Willem J. van den Bogert
- 👤 Christianus J. Roozekrans
- 👤 Markus W. M. Wanninkhof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:11
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133604; H01J61/30; H01J61/305; H01J65/00; H01J65/04; H01J65/042; H01J65/046
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
133 words
A low-pressure mercury vapour discharge lamp comprising a discharge vessel filled with mercury and a rare gas, said discharge vessel comprising two substantially parallel mainly rectangular glass plates which are located at a relatively short distance from each other and which are transparent to light, side walls connecting said plates together in a gas-tight manner proximate their circumference, and electrodes between which a discharge is maintained in the discharge vessel during operation being arranged on the outer side of the discharge vessel, characterized in that the electrodes are strips of conducting material which are arranged on at least two facing side walls and which extend substantially throughout the length of said two facing side walls, said side walls on which said electrodes extend being substantially flat and not intruding into said discharge space.
Claim 2
Dependent Claim
133 words
A low-pressure mercury vapour discharge lamp comprising a discharge vessel filled with mercury and a rare gas, said discharge vessel comprising two substantially parallel mainly rectangular glass plates which are located at a relatively short distance from each other and which are transparent to light, side walls connecting said plates together in a gas-tight manner proximate their circumference, and electrodes between which a discharge is maintained in the discharge vessel during operation being arranged on the outer side of the discharge vessel, characterized in that the electrodes are strips of conducting material which are arranged on at least two facing side walls and which extend substantially throughout the length of said two facing side walls, said side walls on which said electrodes extend being substantially flat and not intruding into said discharge space.
Claim 3
Dependent Claim
30 words
A low-pressure mercury vapour discharge lamp as claimed in claim 1, characterized in that the electrodes extend on the side walls adjoining the long sides of said rectangular glass plates.
Claim 4
Dependent Claim
44 words
A low-pressure mercury vapour discharge lamp as claimed in claim 2, characterized in that each electrode extends on two adjoining side walls, the ends of the electrodes being spaced from each other at the location of two diagonally facing corners of the discharge vessel.
Claim 5
Dependent Claim
24 words
A low-pressure mercury vapour discharge lamp as claimed in claim 3, characterized in that the strips comprise an aluminium foil adhered to the wall.
Claim 6
Dependent Claim
46 words
A low-pressure mercury vapour discharge lamp as claimed in claim 4, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
Claim 7
Dependent Claim
44 words
A low-pressure mercury vapour discharge lamp as claimed in claim 1, characterized in that each electrode extends on two adjoining side walls, the ends of the electrodes being spaced from each other at the location of two diagonally facing corners of the discharge vessel.
Claim 8
Dependent Claim
24 words
A low-pressure mercury vapour discharge lamp as claimed in claim 6, characterized in that the strips comprise an aluminum foil adhered to the wall.
Claim 9
Dependent Claim
46 words
A low-pressure mercury vapour discharge lamp as claimed in claim 7, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
Claim 10
Dependent Claim
24 words
A low-pressure mercury vapour discharge lamp as claimed in claim 1, characterized in that the strips comprise an aluminum foil adhered to the wall.
Claim 11
Dependent Claim
46 words
A low-pressure mercury vapour discharge lamp as claimed in claim 9, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
Claim 12
Dependent Claim
46 words
A low-pressure mercury vapour discharge lamp as claimed in claim 2, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
Claim 13
Dependent Claim
46 words
A low-pressure mercury vapour discharge lamp as claimed in claim 1, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
Claim 14
Dependent Claim
147 words
An information display device having a housing with a flat display screen, said housing accommodating a low pressure mercury vapour discharge lamp comprising a discharge vessel filled with mercury and a rare gas, said discharge vessel comprising two substantially parallel mainly rectangular glass plates which are located at relatively short distance from each other and which are transparent to light, side walls connecting said plates together in a gas-tight manner proximate their circumference, and electrodes arranged on the outer side of the discharge vessel between which a discharge is maintained in the discharge vessel during operation, characterized in that said electrodes are strips of conducting material which are arranged on at least two facing side walls and which extend substantially throughout the length of said two facing side walls, said side walls in which said electrodes extend being substantially flat and not intruding into said discharge space.
Claim 15
Dependent Claim
147 words
An information display device having a housing with a flat display screen, said housing accommodating a low pressure mercury vapour discharge lamp comprising a discharge vessel filled with mercury and a rare gas, said discharge vessel comprising two substantially parallel mainly rectangular glass plates which are located at relatively short distance from each other and which are transparent to light, side walls connecting said plates together in a gas-tight manner proximate their circumference, and electrodes arranged on the outer side of the discharge vessel between which a discharge is maintained in the discharge vessel during operation, characterized in that said electrodes are strips of conducting material which are arranged on at least two facing side walls and which extend substantially throughout the length of said two facing side walls, said side walls in which said electrodes extend being substantially flat and not intruding into said discharge space.
Claim 16
Dependent Claim
29 words
A low-pressure mercury vapour discharge lamp as claimed in claim 13, characterized in that the electrodes extend on the walls adjoining the long sides of said rectangular glass plates.
Claim 17
Dependent Claim
40 words
An information display device as claimed in claim 14, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap.
Claim 18
Dependent Claim
42 words
An information display device as claimed in claim 13, characterized in that each electrode extends on two adjoining side walls, the ends of the electrodes being spaced from each other at the location of two diagonally facing corners of the discharge vessel.
Claim 19
Dependent Claim
44 words
An information display device as claimed in claim 16, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
Claim 20
Dependent Claim
44 words
An information display device as claimed in claim 13, characterized in that the electrodes additionally cover the major part of one of said plates for reflecting light through the opposing glass plate, said electrodes being electrically separated by a gap on said one plate.
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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) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |