US4015165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp with molybdenum contact pins surrounded by non-corrosive metal sleeves
Assignee: US Philips Corp
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Filing: 1975-12-18
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Granted: 1977-03-29
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Expires: 1995-12-18
Abstract
Abstract Electric lamps having a quartz glass lamp envelope frequently have outer current conductors of molybdenum because this metal has a coefficient of expansion which corresponds best to that of quartz glass. Because molybdenum is sensitive to oxidation the current conductors quickly oxidize so that a good electric contact with connection terminals of a current source is no longer possible. According to the invention, the outer current conductors are surrounded by a sleeve of non-corrosive metal and are rigidly connected thereto by a local kink in the current conductor and the sleeve.
Inventors
- 👤 Alfons Eugeen Maria Hardies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:08
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/40; H01K1/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
An electric lamp having a quartz glass lamp envelope with pinched seal, a molybdenum foil being incorporated in the pinch to which foil are connected an inner current conductor and a contact pin which comprises an outer current conductor of molybdenum, a sleeve disposed about part of the outer current conductor projecting beyond the lamp envelope, said sleeve being a corrosion-resistant metal, said current conductor and said sleeve each having a cooperatively dimensioned and configured kink preventing relative movement therebetween.
Claim 2
Dependent Claim
80 words
An electric lamp having a quartz glass lamp envelope with pinched seal, a molybdenum foil being incorporated in the pinch to which foil are connected an inner current conductor and a contact pin which comprises an outer current conductor of molybdenum, a sleeve disposed about part of the outer current conductor projecting beyond the lamp envelope, said sleeve being a corrosion-resistant metal, said current conductor and said sleeve each having a cooperatively dimensioned and configured kink preventing relative movement therebetween.
Claim 3
Dependent Claim
17 words
An electric lamp as claimed in claim 1, wherein said kink is disposed proximate to said pinch.
Claim 4
Dependent Claim
60 words
An electric lamp as claimed in claim 1 wherein said lamp has a plurality of current conductors each serving as a contact pin and each disposed in one pinch, the distance between the contact pins at the area where the pins emanate from said pinch being different from that at the end of the pins most remote from said envelope.
Claim 5
Dependent Claim
23 words
An electric lamp as claimed in claim 1 wherein the end most remote from said envelope of the sleeve is roundedoff or bevelled.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |