Patent US229588A successfully refreshed from Google Patents.
Patent US3746907A successfully refreshed from Google Patents.
US3746907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End cap configuration for ceramic discharge lamp
Assignee: Philips North America LLC
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Filing: 1971-09-08
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Granted: 1973-07-17
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Expires: 1991-09-08
Abstract
Abstract In a ceramic discharge lamp including an elongated tubular ceramic body closed off at each end by electrode carrying refractory metal end caps sealed thereto, the improvement comprising a plurality of inwardly directed indentations circumferentially disposed about the skirt portion of the end cap, said indentations being constructed and arranged to lightly grip the outer surface of the tubular ceramic body and thereby facilitate a superior seal between the end cap and the tubular ceramic body.
Inventors
- 👤 W Knochel
- 👤 L Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:10
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
In a ceramic discharge lamp including an elongated tubular ceramic body closed off at each end by electrode carrying refractory metal end caps, which end caps are cup-shaped each having the configuration of a circular base portion bounded by a ring-shaped skirt portion which overlaps the end portions of the ceramic body and is sealed thereto, the improvement comprising: a plurality of inwardly directed indentations circumferentially disposed about the skirt portion of the end cap, said indentations being constructed and arranged to lightly grip the outer surface of the tubular ceramic body and thereby facilitate a superior seal between the end cap of the tubular ceramic body.
Claim 2
Dependent Claim
107 words
In a ceramic discharge lamp including an elongated tubular ceramic body closed off at each end by electrode carrying refractory metal end caps, which end caps are cup-shaped each having the configuration of a circular base portion bounded by a ring-shaped skirt portion which overlaps the end portions of the ceramic body and is sealed thereto, the improvement comprising: a plurality of inwardly directed indentations circumferentially disposed about the skirt portion of the end cap, said indentations being constructed and arranged to lightly grip the outer surface of the tubular ceramic body and thereby facilitate a superior seal between the end cap of the tubular ceramic body.
Claim 3
Dependent Claim
47 words
The improved end cap configuration for a ceramic discharge lamp according to claim 1 wherein said circular base portion includes a plurality of inwardly directed indentations which serve to define a receptacle for the ends of the arc tube on the inner surface of the end cap.
Claim 4
Dependent Claim
19 words
The improved end cap construction according to claim 1 wherein the number of said inwardly directed indentations is four.
Claim 5
Dependent Claim
125 words
In a ceramic discharge lamp including an elongated tubular ceramic body closed off at each end by an electrode carrying cup-shaped refractory metal end cap sealed to said ceramic body, with said cup-shaped end cap including a planar base portion bounded by a ring shaped side wall which overlaps the end portions of the ceramic body, the improved end cap configuration which comprises: a plurality of inwardly directed substantially equidistantly spaced dimples circumferentially disposed about the side walls of the end cap, with the circumference defined by the internal extent of said dimples approximating the circumference of the outer surface of the arc tube thereby accurately spacing the remainder of the side wall a uniform distance from the outer surface of the tubular body member.
Claim 6
Dependent Claim
125 words
In a ceramic discharge lamp including an elongated tubular ceramic body closed off at each end by an electrode carrying cup-shaped refractory metal end cap sealed to said ceramic body, with said cup-shaped end cap including a planar base portion bounded by a ring shaped side wall which overlaps the end portions of the ceramic body, the improved end cap configuration which comprises: a plurality of inwardly directed substantially equidistantly spaced dimples circumferentially disposed about the side walls of the end cap, with the circumference defined by the internal extent of said dimples approximating the circumference of the outer surface of the arc tube thereby accurately spacing the remainder of the side wall a uniform distance from the outer surface of the tubular body member.
Claim 7
Dependent Claim
29 words
The improved end cap construction according to claim 1 wherein the number of said inwardly directed dimples circumferentially disposed about the side wall of the end cap is four.
Claim 8
Dependent Claim
46 words
The improved cap configuration for a ceramic discharge lamp according to claim 4 wherein said planar base portion includes a plurality of inwardly directed indentations which serve to define a receptacle for the ends of the arc tube on the inner surface of the end cap.
References Cited (Backward Citations)
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |