US3892993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure discharge lamp
Assignee: US Philips Corp
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Filing: 1974-01-22
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Granted: 1975-07-01
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Expires: 1994-01-22
Abstract
Abstract The invention relates to a high-pressure discharge lamp whose discharge tube mainly consists of ceramic material. According to the invention a compartment is present at at least one end of the discharge tube while a wall of this compartment screening at least part of an adjacent electrode consists of ceramic material. The said wall is preferably part of a sealing member of the discharge tube.
Inventors
- 👤 Abraham Timmermans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:02
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; H01J61/04; H01J61/045
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A high-pressure discharge lamp having a first electrode and a second electrode and an elongated cylindrical discharge tube having a filling which comprises a metal, said discharge tube having a wall which consists primarily of ceramic material, the first electrode being disposed at a first end of the discharge tube and the second electrode being disposed at a second end of the discharge tube, a wall defining a compartment between at least one of the electrodes and the adjacent end of the discharge tube, the compartment being in fluid communication with the part of the discharge tube in which the discharge is effected, said wall screening at least part of an adjacent electrode from the interior of said compartment, wherein the portion of wall of the compartment screening at least part of the electrode is made of ceramic material, said wall constituting a part of an entirely ceramic member which is secured to the wall of the discharge tube in a gastight manner.
Claim 2
Dependent Claim
163 words
A high-pressure discharge lamp having a first electrode and a second electrode and an elongated cylindrical discharge tube having a filling which comprises a metal, said discharge tube having a wall which consists primarily of ceramic material, the first electrode being disposed at a first end of the discharge tube and the second electrode being disposed at a second end of the discharge tube, a wall defining a compartment between at least one of the electrodes and the adjacent end of the discharge tube, the compartment being in fluid communication with the part of the discharge tube in which the discharge is effected, said wall screening at least part of an adjacent electrode from the interior of said compartment, wherein the portion of wall of the compartment screening at least part of the electrode is made of ceramic material, said wall constituting a part of an entirely ceramic member which is secured to the wall of the discharge tube in a gastight manner.
Claim 3
Dependent Claim
37 words
A high-pressure discharge lamp as claimed in claim 1, wherein said ceramic member is a sealing member for the end of said discharge tube which is secured in a gastight manner about an entire axial portion thereof.
Claim 4
Dependent Claim
33 words
A high-pressure discharge lamp as claimed in claim 2, wherein the wall of the compartment screening at least a part of the electrode comprises an axially extending annular bulge of said sealing member.
Claim 5
Dependent Claim
24 words
A high-pressure discharge lamp as claimed in claim 3, wherein said annular bulge has a radially extending flange disposed at one axial portion thereof.
Claim 6
Dependent Claim
28 words
A high-pressure discharge lamp as claimed in claim 2, wherein said compartment is substantially entirely bounded by an inner wall of a recess in the entirely ceramic member.
Claim 7
Dependent Claim
76 words
A high-pressure discharge lamp as claimed in claim 2, in which the fluid connection between the compartment and the part of the discharge tube in which the discharge is effected has an annular shape which is bounded at one axial extremity by an electric supply conductor which is connected to the adjacent electrode and at the other axial extremity by the portion of said wall of the compartment which screens at least part of the electrode.
Claim 8
Dependent Claim
65 words
A high-pressure discharge lamp as claimed in claim 6 further including a second ceramic member which is connected at least in a gas-tight manner to the first ceramic Member, and wherein said compartment consists of a recess in at least one of the two ceramic members, said recess being disposed on the axial side of the annular fluid connection most remote from the adjacent electrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |