US4751432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure discharge lamp
Assignee: US Philips Corp
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Filing: 1986-03-20
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Granted: 1988-06-14
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Expires: 2006-03-20
Abstract
Abstract The invention relates to a high-pressure discharge lamp comprising an outer bulb accommodating a first and a second discharge vessel, these discharge vessels being connected electrically in series. According to the invention, the second discharge vessel is electrically shunted by a bimetal switch which is closed at a temperature of at least 300 K. The lamp thus starts in two steps, which facilitates the starting process and renders it more reliable.
Inventors
- 👤 Marc G. A. M. Van Delm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:27
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/34; H01J61/54; H01J61/541; H01J61/92; H01J61/94
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A high-pressure discharge lamp comprising an outer bulb accommodating at least a first and a second discharge vessels, these discharge vessels being connected electrically in series, characterized in that the second discharge vessel is electrically shunted by a bimetal switch which is closed at least at a temperature of 300° K. or lower.
Claim 2
Dependent Claim
53 words
A high-pressure discharge lamp comprising an outer bulb accommodating at least a first and a second discharge vessels, these discharge vessels being connected electrically in series, characterized in that the second discharge vessel is electrically shunted by a bimetal switch which is closed at least at a temperature of 300° K. or lower.
Claim 3
Dependent Claim
25 words
A lamp as claimed in claim 1, characterized in that the first and second discharge vessels are arranged beside each other for the major part.
Claim 4
Dependent Claim
20 words
A lamp as claimed in claim 2, characterized in that the bimetal switch is mounted between the two discharge vessels.
References Cited (Backward Citations)
US2017719A
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US2043023A
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US2203550A
Cited
US2208998A
Cited
US2714689A
Cited
US4321506A
Cited
US4287454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |