Patent US3818558A successfully refreshed from Google Patents.
US3818558A
Expired / Lapsed
US
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Method of making lamp cap connections using superplastic alloy
Assignee: EMI Group Ltd
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Filing: 1973-06-04
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Granted: 1974-06-25
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Expires: 1993-06-04
Abstract
Abstract Electric lamps are disclosed having lead-in wires which extend out of the lamp envelopes and are connected to external electrical terminals, the terminals including hollow metal sleeves receiving the wires and the wires being joined thereto using alloys which exhibit superplastic behaviour, the alloys being heated, without melting, and caused to flow or creep superplastically into the sleeves and around the wires.
Inventors
- 👤 A Vause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:45
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
A method according to claim 1, wherein said hollow member is formed with a re-entrant portion to retain said alloy securely therein.
Claim 2
Dependent Claim
23 words
A method according to claim 1, wherein said hollow member is a metal sleeve serving as a pin terminal in the finished lamp.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said alloy is one which is capable of exhibiting superplastic behaviour at temperatures within the range 200* to 500*C.
Claim 4
Dependent Claim
26 words
A method according to claim 4, wherein said alloy is one which is capable of exhibiting superplastic behaviour at temperatures within the range 250* to 300*C.
Claim 5
Dependent Claim
21 words
A method according to claim 5, wherein the composition of said alloy is 22 weight percent Aluminium; 78 weight percent Zinc.
Claim 6
Dependent Claim
31 words
A method according to claim 1, wherein said alloy is caused to flow into said well under the influence of gravity and with the assistance of pressure applied to said alloy.
Claim 7
Dependent Claim
15 words
A method according to claim 1, wherein said alloy is heated by focussed infra-red radiation.
References Cited (Backward Citations)
US2987696A
Cited
US3713207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |