US3778663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps and discharge devices
Assignee: EMI Group Ltd
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Filing: 1972-03-17
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Granted: 1973-12-11
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Expires: 1992-03-17
Abstract
Abstract An end construction of an electric lamp or discharge device has an hermetic pinch seal through which an electrical lead-out conductor passes, the conductor terminating in a cap unit which includes an externally-insulated metal tube filled with brazing alloy. The cap unit enhances dissipation of heat from the seal and thereby improving resistance to failure of the lead-out conductor by oxidation.
Inventors
- 👤 E Beeson
- 👤 K Furmidge
- 👤 H Stanyon
- 👤 J Speller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:25
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
In an electric lamp having electrical conductors inside an envelope which has an hermetic closure in the form of a flattened pinch end seal: lead-out conductor means electrically connected to a conductor inside said envelope, said conductor means comprising a molybdenum foil and a molybdenum wire welded to said foil, said wire extending outwardly through the end of said flattened end seal, said foil and its welded junction with said wire being embedded within said seal, and a pin-type terminal fitted to said end seal, said terminal comprising a hollow cylindrical metal sleeve which surrounds the outwardly-extending molybdenum wire and abuts the end of said end seal to form a well therewith, brazing alloy substantially filling said well, said alloy contacting said end of said end seal and being in thermal and electrical contact with said wire, and a cylindrical ceramic sleeve cemented to the outer surface of said hollow metal sleeve, said ceramic sleeve having a longitudinally-slotted portion which embraces the end of said end seal.
Claim 2
Dependent Claim
167 words
In an electric lamp having electrical conductors inside an envelope which has an hermetic closure in the form of a flattened pinch end seal: lead-out conductor means electrically connected to a conductor inside said envelope, said conductor means comprising a molybdenum foil and a molybdenum wire welded to said foil, said wire extending outwardly through the end of said flattened end seal, said foil and its welded junction with said wire being embedded within said seal, and a pin-type terminal fitted to said end seal, said terminal comprising a hollow cylindrical metal sleeve which surrounds the outwardly-extending molybdenum wire and abuts the end of said end seal to form a well therewith, brazing alloy substantially filling said well, said alloy contacting said end of said end seal and being in thermal and electrical contact with said wire, and a cylindrical ceramic sleeve cemented to the outer surface of said hollow metal sleeve, said ceramic sleeve having a longitudinally-slotted portion which embraces the end of said end seal.
Claim 3
Dependent Claim
53 words
The combination according to claim 1, wherein said outwardly-extending portion of wire extends part-way along the length of said metal sleeve and its filling of brazing alloy, said portion of wire being completely surrounded by said alloy including the end of said wire, whereby said end of wire is protected against oxygen attack.
Claim 4
Dependent Claim
26 words
The combination according to claim 1, wherein the surface of said brazing alloy at the remote end of said metallic sleeve from said seal is concave.
Claim 5
Dependent Claim
30 words
The combination according to claim 1, wherein said metallic sleeve is made from material containing a major proportion of copper and said brazing alloy is a silver content copper-brazing material.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |