US4383200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury vapor discharge lamp
Assignee: US Philips Corp
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Filing: 1981-02-26
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Granted: 1983-05-10
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Expires: 2001-02-26
Abstract
Abstract Low-pressure mercury vapor discharge lamp comprising a, preferably folded, discharge tube located within a lamp envelope and having electrodes and an electric stabilization ballast, which is partly surrounded by a thin-walled lamp base, which is connected to the envelope. In the region of the connection between the lamp base and the lamp envelope there is a metal plate for cooling the ballast, this heat sink being at the same time a mounting plate for further components in the lamp such as a starter switch.
Inventors
- 👤 Adrianus J. H. J. Van Zon
- 👤 Johannes R. Gelens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:47
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A low-pressure mercury vapor discharge lamp including a lamp envelope member, a discharge tube therein which is closed in a vacuum-tight manner and contains mercury and a rare gas, electrodes between which a discharge takes place during operation being arranged one at each end of the discharge tube, an electric stabilization ballast for the discharge, and a hollow lamp base member which is connected to the envelope member and a lampcap member for fitting the lamp in a luminaire, and a metal plate, at least the electric stabilization ballast and the ends of the discharge tube being connected to the metal plate, the metal plate being arranged near the connection of the lamp base member to the lamp envelope member and extends to one of said members, the metal plate having upright walls with which one or more walls of the ballast are in intimate thermal contact.
Claim 2
Dependent Claim
147 words
A low-pressure mercury vapor discharge lamp including a lamp envelope member, a discharge tube therein which is closed in a vacuum-tight manner and contains mercury and a rare gas, electrodes between which a discharge takes place during operation being arranged one at each end of the discharge tube, an electric stabilization ballast for the discharge, and a hollow lamp base member which is connected to the envelope member and a lampcap member for fitting the lamp in a luminaire, and a metal plate, at least the electric stabilization ballast and the ends of the discharge tube being connected to the metal plate, the metal plate being arranged near the connection of the lamp base member to the lamp envelope member and extends to one of said members, the metal plate having upright walls with which one or more walls of the ballast are in intimate thermal contact.
Claim 3
Dependent Claim
21 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1, wherein there are four upstanding walls closely surrounding the ballast.
Claim 4
Dependent Claim
25 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 2, wherein the upright walls have means for connecting the discharge tube thereto.
Claim 5
Dependent Claim
51 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 3, wherein the metal plate has on at least a portion of its circumference a raised edge which engages the outside of the lamp envelope member and the lamp base member engagingly clamps the envelope member around said edge.
Claim 6
Dependent Claim
23 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 3 wherein a starter switch is arranged on the metal plate.
Claim 7
Dependent Claim
31 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 3, characterized in that the side of the metal plate facing the discharge tube is coated with reflecting material.
Claim 8
Dependent Claim
23 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 3, characterized in that the metal plate is made of aluminium.
Claim 9
Dependent Claim
35 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 3 wherein the ballast includes a plurality of laminations and the metal plate is constituted by at least one of the ballast laminations.
Claim 10
Dependent Claim
43 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 3 further including a clamp spring and the discharge tube is connected to the plate by means of the clamp spring which cooperates with an upright edge of the metal plate.
References Cited (Backward Citations)
US4300073A
Cited
US4270071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |