Patent US4307315A successfully refreshed from Google Patents.
US4307315A
Expired / Lapsed
US
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High pressure discharge lamp with vessel having a UV radiation absorbing portion of quartz glass
Assignee: US Philips Corp
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Filing: 1978-12-21
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Granted: 1981-12-22
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Expires: 1998-12-21
Abstract
Abstract High-pressure discharge lamp according to the invention have a quartz glass lamp vessel (1) which consists locally of UV-absorbing quartz glass (shaded region 2). During operation of the lamps the normally colder wall parts of the lamp vessel in this region thus assume a higher temperature, as a result of which the efficiency of the lamp is increased while said regions (2) nevertheless remain transparent to visible radiation.
Inventors
- 👤 Charles C. E. Meulemans
- 👤 Gerardus H. A. M. van der Steen
- 👤 Jan van Werkhoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:10
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A high-pressure discharge lamp having a tubular, vacuum-tight sealed quartz glass lamp vessel, a pair of electrodes disposed in said vessel, current supply conductors extending through the wall of said vessel to said pair of electrodes, said lamp vessel having an ionizable gas filling and means to locally increase the temperature of one or more regions of the lamp vessel during operation, said lamp vessel having at least one region which consists solely of ultraviolet radiation-absorbing quartz glass, which is transparent to visible radiation, the remainder of said vessel being composed of a different quartz material which is ultraviolet radiation transmitting.
Claim 2
Dependent Claim
101 words
A high-pressure discharge lamp having a tubular, vacuum-tight sealed quartz glass lamp vessel, a pair of electrodes disposed in said vessel, current supply conductors extending through the wall of said vessel to said pair of electrodes, said lamp vessel having an ionizable gas filling and means to locally increase the temperature of one or more regions of the lamp vessel during operation, said lamp vessel having at least one region which consists solely of ultraviolet radiation-absorbing quartz glass, which is transparent to visible radiation, the remainder of said vessel being composed of a different quartz material which is ultraviolet radiation transmitting.
Claim 3
Dependent Claim
32 words
A high-pressure discharge lamp as claimed in claim 1, characterized in that one end of the lamp vessel consists of UV-absorbing quartz glass up to the remote end of the associated electrode.
Claim 4
Dependent Claim
51 words
A high-pressure discharge lamp as claimed in claim 2, in which at each of the ends of the lamp vessel a current conductor to an electrode arranged near the respective end is sealed, characterized in that the UV-absorbing quartz glass further extends along a part of the space between the electrodes.
Claim 5
Dependent Claim
49 words
A high-pressure discharge lamp as claimed in claim 2, in which at each of the ends of the lamp vessel a current conductor to an electrode arranged near the respective end is sealed, characterized in that the other end of the lamp vessel similarly consists of UV-absorbing quartz glass.
Claim 6
Dependent Claim
31 words
A high-pressure discharge lamp as claimed in claim 1, characterized in that the lamp vessel consists of UV-absorbing quartz glass solely for a part of its circumference over its whole length.
References Cited (Backward Citations)
US2291952A
Cited
US2326773A
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US2434980A
Cited
US3451579A
Cited
US3848152A
Cited
US3851200A
Cited
US3900750A
Cited
US3963951A
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |