Patent US4140939A successfully refreshed from Google Patents.
US4140939A
Expired / Lapsed
US
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Tungsten halogen lamp for headlights
Assignee: GTE Sylvania Inc
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Filing: 1978-04-26
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Granted: 1979-02-20
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Expires: 1998-04-26
Abstract
Abstract A tungsten-halogen lamp for use in motor vehicle headlights comprises a tubular sealed glass capsule containing two coiled tungsten filaments, parallel to each other and disposed substantially orthogonally to the axis of the capsule. The two filaments are offset laterally from each other and one of the filaments is a coiled coil, in order to reduce the lateral traverse of both filaments.
Inventors
- 👤 Robert P. Bonazoli
- 👤 Stephen F. Kimball, III
- 👤 Lewis H. Palmer, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:55
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/02; H01K1/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
A tungsten-halogen capsule for use in a motor vehicle headlight comprising: a tubular sealed glass capsule; two tungsten filaments disposed in the capsule, the filaments being spaced apart and parallel to each other and substantially orthogonal to the axis of the capsule, one of the filaments being a once coiled filament and the other being a coiled coil filament, the filaments being laterally offset from each other.
Claim 2
Dependent Claim
67 words
A tungsten-halogen capsule for use in a motor vehicle headlight comprising: a tubular sealed glass capsule; two tungsten filaments disposed in the capsule, the filaments being spaced apart and parallel to each other and substantially orthogonal to the axis of the capsule, one of the filaments being a once coiled filament and the other being a coiled coil filament, the filaments being laterally offset from each other.
Claim 3
Dependent Claim
20 words
The capsule of claim 1 wherein the filaments are supported on lead-in wires embedded in the seal of the capsule.
Claim 4
Dependent Claim
17 words
The capsule of claim 1 wherein the coiled coil filament is shorter than the once coiled filament.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |