US4127790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure discharge lamp
Assignee: US Philips Corp
•
Filing: 1977-09-20
•
Granted: 1978-11-28
•
Expires: 1997-09-20
Abstract
Abstract A high-pressure discharge lamp having a hydrogen getter in the lamp vessel disposed in a metal envelope which is hydrogen-permeable. The hydrogen-permeable metal of the envelope is covered with a porous halogen-resistant layer. The atoms of the metal halides dissociated in the discharge can recombine at the porous layer so that blackening of the discharge vessel is mitigated.
Inventors
- 👤 Gijsbert Kuus
- 👤 Adriaan J. DE Ridder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:40
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/24; H01J61/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
50 words
A high-pressure discharge lamp which comprises a discharge vessel, first and second electrodes, a gas filling, a hydrogen getter, a metal envelope having a portion which is hydrogen permeable disposed about said hydrogen getter and a porous halogen resistant layer covering said portion of said envelope which is hydrogen-permeable metal.
Claim 2
Dependent Claim
50 words
A high-pressure discharge lamp which comprises a discharge vessel, first and second electrodes, a gas filling, a hydrogen getter, a metal envelope having a portion which is hydrogen permeable disposed about said hydrogen getter and a porous halogen resistant layer covering said portion of said envelope which is hydrogen-permeable metal.
Claim 3
Dependent Claim
42 words
A high-pressure discharge lamp as claimed in claim 1 wherein said porous covering layer consists of a metal selected from the group consisting of tungsten, molybdenum, a nitride, carbide or oxide of a lanthanide, of yttrium, scandium, aluminium, zirconium or of hafnium.
Claim 4
Dependent Claim
36 words
An assembly for use in an associated high-pressure discharge lamp which comprises a hydrogen-permeable envelope and a hydrogen getter disposed in said envelope, said hydrogen-permeable metal of the envelope being covered with a porous halogen-resistant layer.
Claim 5
Dependent Claim
36 words
An assembly for use in an associated high-pressure discharge lamp which comprises a hydrogen-permeable envelope and a hydrogen getter disposed in said envelope, said hydrogen-permeable metal of the envelope being covered with a porous halogen-resistant layer.
References Cited (Backward Citations)
US3953755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |