US3885149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp pinch seals
Assignee: EMI Group Ltd
•
Filing: 1973-04-04
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Granted: 1975-05-20
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Expires: 1993-04-04
Abstract
Abstract In an electric lamp having a pinch which hermetically seals the lamp envelope to thin foils forming part of lead-in conductors to the lamp filament, the central part of the pinch containing the foils is offset sideways slightly during pinch sealing, to prevent the inner parts of the conductors, which connect the filament to the foils, being deflected so that these parts extend into the interior of the envelope parallel to the central axis through the lamp.
Inventors
- 👤 Kenneth Roy Wolfe
- 👤 Clive Arthur Evander Underwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
169 words
An electric lamp comprising: an envelope, support means within said envelope, a filament carried by said support means, said support means including means for electrically connecting said filament to an external supply, said connecting means comprising: at least two inner conductors, two externally-accessible outer conductors and a separate conductive foil joining each of said inner conductors to an outer conductor, said envelope having at least one pinch seal for sealing the envelope to said foils so that each of said foils is embedded in a pinch seal and equal thicknesses of envelope material are in contact with the opposite surfaces of each of said foils, a portion of said pinch seal within at least one of which said foils is embedded being displaced laterally with respect to the remainder of said seal, and each of said inner conductors leading into the interior of said envelope from its associated foil in a direction parallel to a central longitudinal axis through said lamp, said foils being laterally displaced from said axis.
Claim 2
Dependent Claim
169 words
An electric lamp comprising: an envelope, support means within said envelope, a filament carried by said support means, said support means including means for electrically connecting said filament to an external supply, said connecting means comprising: at least two inner conductors, two externally-accessible outer conductors and a separate conductive foil joining each of said inner conductors to an outer conductor, said envelope having at least one pinch seal for sealing the envelope to said foils so that each of said foils is embedded in a pinch seal and equal thicknesses of envelope material are in contact with the opposite surfaces of each of said foils, a portion of said pinch seal within at least one of which said foils is embedded being displaced laterally with respect to the remainder of said seal, and each of said inner conductors leading into the interior of said envelope from its associated foil in a direction parallel to a central longitudinal axis through said lamp, said foils being laterally displaced from said axis.
Claim 3
Dependent Claim
46 words
A lamp according to claim 1, wherein said envelope has a single pinch seal into which each of said inner and outer conductors protrude, said portion of said seal containing said embedded foils having a projection on one face and a depression in its opposite face.
Claim 4
Dependent Claim
49 words
A lamp according to claim 1, further including seal capping and lamp mounting means attached to said envelope said envelope having a shoulder providing a reference abutment for said capping and mounting means, and said shoulder being at a predetermined location relative to a given point inside said envelope.
Claim 5
Dependent Claim
35 words
A lamp according to claim 3, wherein said capping and mounting means comprises: a capping box in abutment with said shoulder, a sleeve encasing said capping box, and a focussing collar secured to said sleeve.
Claim 6
Dependent Claim
29 words
A lamp according to claim 1, having a further filament carried by said supporting means, said supporting means including at least three inner and outer conductors and interconnecting foils.
Claim 7
Dependent Claim
27 words
A lamp according to claim 5, wherein said inner conductors enter a single pinch seal and all lie in a common plane containing said central longitudinal axis.
Claim 8
Dependent Claim
15 words
A lamp according to claim 5, further including a reflector carried by the supporting means.
Claim 9
Dependent Claim
123 words
A lamp according to claim 1, further including a second filament, both said filaments being made of tungsten, said envelope being quartz and containing a halogen gas, and said support means carrying a reflector adjacent one of said filaments, one end of each of said filaments being connected to a first inner conductor, and the other ends of said filaments being respectively connected to second and third inner conductors, said first, second and third inner conductors being connected through associated molybdenum foils to associated outer conductors, said foils being embedded in a common pinch seal, and said inner conductors lying adjacent one another in a common plane containing said central longitudinal axis, said foils lying in a displaced plane parallel to said axis.
Claim 10
Dependent Claim
52 words
A lamp according to claim 8, wherein said common pinch seal has a reference shoulder on one face thereof and futher including seal capping and lamp mounting means embracing said seal, said seal capping and lamp mounting means having means abutting said shoulder and a portion of said envelope adjacent said seal.
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |