US4029985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectangular headlamp filament shield
Assignee: General Electric Co
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Filing: 1976-03-24
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Granted: 1977-06-14
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Expires: 1996-03-24
Abstract
Abstract A filament shield is disclosed which eliminates much of the lower beam glare caused by the rectangular shape of the headlamp.
Inventors
- 👤 Bernard W. Rachel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:06
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/26; F; F21; F21S; F21S41/00; F21S41/10; F21S41/14; F21S41/162; F21S41/164; F21S41/168; F21S41/40; F21S41/43; H01K9/00; H01K9/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
In a rectangular headlamp having a lens, a reflector in the shape of paraboloid intersected by four planes which form the sidewalls thereof, and at least one filament positioned in the region of the focus of said paraboloid, the improvement comprising: filament shield means having a first portion positioned between said filament and said lens and a second portion comprising a plurality of tabs positioned between said filament and respective sidewalls, wherein said first portion is geometrically similar to said lens and said tabs are geometrically similar to the respective sidewalls.
Claim 2
Dependent Claim
91 words
In a rectangular headlamp having a lens, a reflector in the shape of paraboloid intersected by four planes which form the sidewalls thereof, and at least one filament positioned in the region of the focus of said paraboloid, the improvement comprising: filament shield means having a first portion positioned between said filament and said lens and a second portion comprising a plurality of tabs positioned between said filament and respective sidewalls, wherein said first portion is geometrically similar to said lens and said tabs are geometrically similar to the respective sidewalls.
Claim 3
Dependent Claim
14 words
The headlamp as set forth in claim 1 wherein said first portion is planar.
Claim 4
Dependent Claim
15 words
The headlamp as set forth in claim 1 wherein said first portion is three dimensional.
Claim 5
Dependent Claim
21 words
The rectangular headlamp as set forth in claim 1 wherein said tabs are attached to the periphery of said first portion.
Claim 6
Dependent Claim
14 words
The headlamp as set forth in claim 4 wherein said shield is completely opaque.
Claim 7
Dependent Claim
28 words
The rectangular headlamp as set forth in claim 4 wherein said first portion contains an aperture for selectively permitting light from said filament to reach said lens directly.
Claim 8
Dependent Claim
24 words
The rectangular headlamp as set forth in claim 6 wherein said lamp comprises two filaments, one of which intersects the focus of said paraboloid.
Claim 9
Dependent Claim
21 words
The rectangular headlamp as set forth in claim 7 wherein said filament shield means includes the non-incandescent one of said filaments.
Claim 10
Dependent Claim
20 words
The rectangular headlamp as set forth in claim 8 wherein said filament shield means includes the other of said filaments.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |