Patent US3649864A successfully refreshed from Google Patents.
US3649864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure discharge lamp having an envelope encompassing the discharge space and consisting inter alia of a support
Assignee: US Philips Corp
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Filing: 1969-09-16
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Granted: 1972-03-14
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Expires: 1989-09-16
Abstract
Abstract A low-pressure glow discharge lamp having an envelope encompassing the discharge space formed from a ceramic dielectric material which is coated by layers of electrical conducting material to function as a self-ballasting capacitor for stabilizing the electric discharge in the lamp.
Inventors
- 👤 Petrus Johannes Mari Willemsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:15
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/56
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A discharge lamp comprising an oblong envelope forming a discharge space, end parts for hermetically sealing said envelope, said envelope essentially consisting of a transparent ceramic dielectric material having a coefficient of expansion substantially equal to that of said end parts, an ionizing gas filling said discharge space, electrodes for producing a gaseous discharge within said envelope, electrically conductive transparent layers on opposite sides of said envelope in confronting relationship, the inner conduction layer functioning as one of said electrodes in said discharge space, the inner and outer conducting layers and said dielectric material forming a ballasting capacitor in series with said discharge space for stabilizing said gaseous discharge within said lamp, an electrode functioning as the second of said electrodes in said discharge space, and terminal means for providing current to said lamp.
Claim 2
Dependent Claim
134 words
A discharge lamp comprising an oblong envelope forming a discharge space, end parts for hermetically sealing said envelope, said envelope essentially consisting of a transparent ceramic dielectric material having a coefficient of expansion substantially equal to that of said end parts, an ionizing gas filling said discharge space, electrodes for producing a gaseous discharge within said envelope, electrically conductive transparent layers on opposite sides of said envelope in confronting relationship, the inner conduction layer functioning as one of said electrodes in said discharge space, the inner and outer conducting layers and said dielectric material forming a ballasting capacitor in series with said discharge space for stabilizing said gaseous discharge within said lamp, an electrode functioning as the second of said electrodes in said discharge space, and terminal means for providing current to said lamp.
Claim 3
Dependent Claim
21 words
A discharge lamp as claimed in claim 1 wherein said second electrode is positioned along the longitudinal axis of said lamp.
Claim 4
Dependent Claim
29 words
A discharge lamp as claimed in claim 1 wherein said transparent ceramic dielectric material essentially consists of barium titanate and said electrically conducting material essentially consists of tin oxide.
Claim 5
Dependent Claim
23 words
A discharge lamp as claimed in claim 1 further comprising a lacquer coating of a transparent insulating material for said electrically conducting material.
Claim 6
Dependent Claim
18 words
A discharge lamp as claimed in claim 4 wherein said lacquer coating partly consists of a reflective material.
Claim 7
Dependent Claim
36 words
A discharge lamp as claimed in claim 1 wherein said end parts essentially consist of glass, one of said end parts being in the form of a hemispherical bead and the other having an arclike profile.
Claim 8
Dependent Claim
26 words
A discharge lamp as claimed in claim 1 wherein said end parts are flat thin walled portions positioned transverse to the longitudinal axis of said lamp.
Claim 9
Dependent Claim
20 words
A discharge lamp as claimed in claim 1 wherein said internal electrically conductive, transparent layer has a low work function.
Claim 10
Dependent Claim
124 words
A discharge lamp comprising an oblong envelope forming a discharge space, end parts for hermetically sealing said envelope, said envelope essentially consisting of a transparent ceramic dielectric material having a coefficient of expansion substantially equal to that of said end parts, an ionizing gas filling said discharge space, at least one pair of electrically conductive transparent layers spaced apart on opposite sides of said envelope in confronting relationships, the internal conducting layer functioning as an electrode for producing a gaseous discharge, the inner and outer conducting layers and said dielectric material forming a ballasting capacitor in series with said discharge space to stabilize said gaseous discharge within said lamp, and terminal means connected to said external conducting layers for providing current to said lamp.
Claim 11
Dependent Claim
124 words
A discharge lamp comprising an oblong envelope forming a discharge space, end parts for hermetically sealing said envelope, said envelope essentially consisting of a transparent ceramic dielectric material having a coefficient of expansion substantially equal to that of said end parts, an ionizing gas filling said discharge space, at least one pair of electrically conductive transparent layers spaced apart on opposite sides of said envelope in confronting relationships, the internal conducting layer functioning as an electrode for producing a gaseous discharge, the inner and outer conducting layers and said dielectric material forming a ballasting capacitor in series with said discharge space to stabilize said gaseous discharge within said lamp, and terminal means connected to said external conducting layers for providing current to said lamp.
Claim 12
Dependent Claim
18 words
A discharge lamp as claimed in claim 9 wherein said electrically conductive transparent layErs have a semicylindrical shape.
References Cited (Backward Citations)
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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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |