US3832589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure metal vapor discharge lamps, particularly sodium vapor lamps with hermetic seal
Assignee: Osram GmbH
•
Filing: 1973-02-27
•
Granted: 1974-08-27
•
Expires: 1993-02-27
Abstract
Abstract An annular member of ceramic is fitted into each end of the cylindrical arc tube of refractory light-transmissive material such as polycrystalline alumina and connected to the arc tube by sintering or by a glass or metal solder and having a hollow lead sealed internally thereof; the arrangement and the dimensions are so selected that the point of sealing of the annular member to the arc tube is protected from corrosion and a bubble-free solder seal is achieved.
Inventors
- 👤 J Pfaue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:12
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
189 words
A hermetically sealed high-pressure metal vapor discharge lamp comprising a cylindrical discharge vessel (1) of refractory, light-transmissive material anD structural components associated therewith wherein one of the structural components is an annular member (2) of ceramic which fits into the end of the vessel (1) and having a hollow lead (3, 3'') sealed inside the annular member (2), seal means (9) sealing the annular member (2) within the vessel to connect said member to the vessel (1), wherein the length of the annular member (2) is at least half and not more than three times its largest outer diameter; the inner diameter of the annular member (2) is constant at least along that section to which the hollow lead (3, 3'') is sealed; the outer diameter of the end of the annular member (2) facing the discharge space is reduced over a length not more than two thirds of the length of the annular member (2); and the seal (9) between the vessel (1) and the ceramic annular member (2) extends only over a portion of the length of the annular member which projects internally of the vessel (1).
Claim 2
Dependent Claim
189 words
A hermetically sealed high-pressure metal vapor discharge lamp comprising a cylindrical discharge vessel (1) of refractory, light-transmissive material anD structural components associated therewith wherein one of the structural components is an annular member (2) of ceramic which fits into the end of the vessel (1) and having a hollow lead (3, 3'') sealed inside the annular member (2), seal means (9) sealing the annular member (2) within the vessel to connect said member to the vessel (1), wherein the length of the annular member (2) is at least half and not more than three times its largest outer diameter; the inner diameter of the annular member (2) is constant at least along that section to which the hollow lead (3, 3'') is sealed; the outer diameter of the end of the annular member (2) facing the discharge space is reduced over a length not more than two thirds of the length of the annular member (2); and the seal (9) between the vessel (1) and the ceramic annular member (2) extends only over a portion of the length of the annular member which projects internally of the vessel (1).
Claim 3
Dependent Claim
34 words
Lamp according to claim 1, wherein the inner diameter of the internally projecting end of the annular member facing the discharge space varies relative to that section to which the hollow lead is sealed.
Claim 4
Dependent Claim
31 words
Lamp according to claim 1, wherein the outer diameter of the end of the annular member facing the discharge space is reduced at most along half the length of said member.
Claim 5
Dependent Claim
33 words
Lamp according to claim 1, wherein the annular member includes a cylindrical section, and at least one annular groove is provided in the outside circumference of the cylindrical section of the annular member.
Claim 6
Dependent Claim
21 words
Lamp according to claim 1, wherein the annular member includes a cylindrical section having two grooves formed at the outside circumference.
Claim 7
Dependent Claim
30 words
Lamp according to claim 1, wherein the end portion of the annular member which projects internally of the vessel free from the seal comprises the portion of reduced outer diameter.
Claim 8
Dependent Claim
29 words
Lamp according to claim 1, wherein the lamp is a high-pressure sodium vapor discharge lamp; the discharge vessel is of polycrystalline alumina; and the hollow lead is of niobium.
Claim 9
Dependent Claim
60 words
Lamp according to claim 7, wherein the inner diameter of the internally projecting end of the annular member facing the discharge space varies relative to that section to which the hollow lead is sealed, and the outer diameter of the end of the annular member facing the discharge space is reduced at most across half the length of said member.
Claim 10
Dependent Claim
33 words
Lamp according to claim 7, wherein the annular member includes a cylindrical section, and at least one annular groove is provided in the outside circumference of the cylindrical section of the annular member.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |