US3868531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric incandescent lamp and method of manufacturing same
Assignee: US Philips Corp
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Filing: 1973-08-20
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Granted: 1975-02-25
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Expires: 1993-08-20
Abstract
Abstract The invention relates to an electric incandescent lamp which comprises a lamp cap having hollow contact pins, in which current conductors emerging from the lamp envelope are soldered in the cavity of the contact pins. On the free end of the contact pin the cavity is open and shows a narrowing in which the current conductor projects with a small amount of play. The part of the cavity present near the free end of the contact pin and a part of the narrowing are filled with soldering material. The invention furthermore relates to a method of manufacturing such an incandescent lamp in which during the soldering operation the contact pins assume a position in which their free end is uppermost. The invention finally relates to an incandescent lamp manufactured by said method.
Inventors
- 👤 Fraeye Dirk Jules Remi De
- 👤 Jan Alfons Catharina Mewissen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/38; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
An electric incandescent lamp having an envelope which comprises a lamp cap manufactured from an insulating material a pair of elongated contact pins each having an axial passageway therein, said pins being carried by said lamp cap, and a current conductor extending from the lamp envelope through each passageway, each of said conductors being soldered in said passageway in which said conductor is disposed, each of said passageways comprising first, second and third axial sections, said second axial section having a cross-sectional area smaller than said first and third sections, said third section being disposed distal to the lamp envelope and being the axial extremity of said pin, said third axial section being at least partly filled with solder each of said axial sections being dimensional in closely spaced engagement with the circumFerence of said conductor carried therein, said closely spaced relationship permitting the flow of molten solder therebetween and substantially limiting radial play therebetween.
Claim 2
Dependent Claim
155 words
An electric incandescent lamp having an envelope which comprises a lamp cap manufactured from an insulating material a pair of elongated contact pins each having an axial passageway therein, said pins being carried by said lamp cap, and a current conductor extending from the lamp envelope through each passageway, each of said conductors being soldered in said passageway in which said conductor is disposed, each of said passageways comprising first, second and third axial sections, said second axial section having a cross-sectional area smaller than said first and third sections, said third section being disposed distal to the lamp envelope and being the axial extremity of said pin, said third axial section being at least partly filled with solder each of said axial sections being dimensional in closely spaced engagement with the circumFerence of said conductor carried therein, said closely spaced relationship permitting the flow of molten solder therebetween and substantially limiting radial play therebetween.
Claim 3
Dependent Claim
25 words
An electric incandescent lamp as claimed in claim 1 wherein said solder extends axially in each of said contact pins into said second axial section.
Claim 4
Dependent Claim
28 words
An electric incandescent lamp as claimed in claim 2, wherein said third axial section forms a truncated cone in the axial portion thereof proximate said second axial section.
Claim 5
Dependent Claim
21 words
The apparatus as described in claim 1 wherein said first and third axial sections taper smoothly into said second axial section.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |