US3736451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooled electrode for high power electric discharge lamps
Assignee: Individual
•
Filing: 1972-07-12
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Granted: 1973-05-29
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Expires: 1992-07-12
Abstract
Abstract To prevent blackening of the discharge tube, the interior space of the electrode has an axially disposed tube forming a central supply duct and an outer discharge duct for the coolant therein. The face is of highly heat-conductive material, such as copper, with a wall thickness of at most that of the outer tube. The interior face is provided in its center with an internally projecting part and extends radially outwardly in concave curvature while the duct formed between supply tube and interior face is of a width small relative to the discharge duct. The projecting part which may be a depending tip, or a rod extends towards or may be mounted inside the supply tube.
Inventors
- 👤 G Weninger
- 👤 H Popp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:52
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/52; H01J61/523; H01J61/526
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
206 words
Electrode structure for combination with electric discharge lamp of high power rating comprising a hollow cylindrical electrode body (1) closed at one end (2) and adapted to project into the discharge lamp; tube means (5, 5'') axially located within the electrode body and subdividing the interior space of the electrode body into a central supply duct and an outer discharge duct for cooling fluid; the closed face of the electrode body being made of highly heat conductive material, and the electrode face having a wall thickness not more than about the wall thickness of the cylindrical portion of the body (1); the interior surface (3) of the closed electrode end (2) being of continuous, radially outwardly extending concave curvature; a central projecting part (4, 6) extending interiorly inwardly from said surface towards the tube means and forming an origin for said surface of said concave curvature; and wherein the space between the interior surface (3) of the electrode end (2) and the supply tube means (5, 5'') is small relative to the cross-sectional area of the dischare duct formed between the supply tube means and the cylindrical electrode wall to provide for high flow velocities of cooli1g fluid in the region beneath the tube end (2).
Claim 2
Dependent Claim
206 words
Electrode structure for combination with electric discharge lamp of high power rating comprising a hollow cylindrical electrode body (1) closed at one end (2) and adapted to project into the discharge lamp; tube means (5, 5'') axially located within the electrode body and subdividing the interior space of the electrode body into a central supply duct and an outer discharge duct for cooling fluid; the closed face of the electrode body being made of highly heat conductive material, and the electrode face having a wall thickness not more than about the wall thickness of the cylindrical portion of the body (1); the interior surface (3) of the closed electrode end (2) being of continuous, radially outwardly extending concave curvature; a central projecting part (4, 6) extending interiorly inwardly from said surface towards the tube means and forming an origin for said surface of said concave curvature; and wherein the space between the interior surface (3) of the electrode end (2) and the supply tube means (5, 5'') is small relative to the cross-sectional area of the dischare duct formed between the supply tube means and the cylindrical electrode wall to provide for high flow velocities of cooli1g fluid in the region beneath the tube end (2).
Claim 3
Dependent Claim
36 words
Electrode structure according to claim 1, wherein the part (4) projecting from the center of the inner surface (3) is a tapering tip; and the interior surface of the electrode end (2) is of cardioid shape.
Claim 4
Dependent Claim
30 words
Electrode structure according to claim 1, wherein the part projecting from the interior surface of the tube end (2) is a projecting rod (6) extending into the supply tube means.
Claim 5
Dependent Claim
85 words
Electrode structure according to claim 3, wherein the supply tube means comprises a tube (5'') and an end part (8), said end part being located between the end of the tube (5'') and the inner surface (3) of the electrode; a recess formed in the end part, the rod (6) being located against said recess to support the end of the electrode; and axial ducts (9) formed in said end part (8) communicating between the tube (5'') and the inner surface (3'') of the electrode.
Claim 6
Dependent Claim
24 words
Electrode structure according to claim 1, wherein the wall thickness of the end of the electrode (2) is between about 0.5 and 3 mm.
Claim 7
Dependent Claim
42 words
Electrode structure according to claim 1, wherein the spacing of the interior surface (3) of the electrode end (2) from the coolant supply tube means (5, 5'') in the region of said electrode end (2) is between about 0.5 and 5 mm.
References Cited (Backward Citations)
US3531673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |