Patent US4731713A successfully refreshed from Google Patents.
US4731713A
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Fog lamp
Assignee: Robert Bosch GmbH
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Filing: 1986-03-24
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Granted: 1988-03-15
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Expires: 2006-03-24
Abstract
Abstract A fog lamp is comprised of a reflector and a pane connected to the reflector. An incandescent lamp is positioned inside the reflector which has a lower portion formed by paraboloid and an upper portion the vertical cross-section of which is formed by ellipse while its horizontal cross-section is formed by parabola. The upper and lower portions have a common focus and a common focal length.
Inventors
- 👤 Peter Perthus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:49
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/02; B60Q1/04; B60Q1/18; B60Q1/20; F; F21; F21S; F21S41/00; F21S41/30; F21S41/32; F21S41/33; F21S41/334; F21S41/335
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
150 words
A fog lamp for a motor vehicle, comprising a reflector, a transparent pane connected to said reflector, and an incandescent lamp accommodated in said reflector, said reflector having an upper portion and a lower portion separated from each other by a horizontal central plane, said lower portion being formed by a portion of paraboloid, said upper portion constituting a reflection surface which has every vertical section formed by ellipse and every horizontal section formed by parabola, wherein focuses of the paraboloid, parabola and ellipse are identical and form a focus of said reflector, said incandescent lamp being positioned in the region of said focus and being cylindrical and having an axis which is horizontal and extends at right angles to an optical axis of the fog lamp, said focus lying within said incandescent lamp, whereby a rough light beam with a concentrated core for a required light-dark limit is obtained.
Claim 2
Dependent Claim
150 words
A fog lamp for a motor vehicle, comprising a reflector, a transparent pane connected to said reflector, and an incandescent lamp accommodated in said reflector, said reflector having an upper portion and a lower portion separated from each other by a horizontal central plane, said lower portion being formed by a portion of paraboloid, said upper portion constituting a reflection surface which has every vertical section formed by ellipse and every horizontal section formed by parabola, wherein focuses of the paraboloid, parabola and ellipse are identical and form a focus of said reflector, said incandescent lamp being positioned in the region of said focus and being cylindrical and having an axis which is horizontal and extends at right angles to an optical axis of the fog lamp, said focus lying within said incandescent lamp, whereby a rough light beam with a concentrated core for a required light-dark limit is obtained.
Claim 3
Dependent Claim
27 words
The fog lamp as defined in claim 1, wherein focal lengths of the paraboloid, parabola and ellipse are identical and form a local length of said reflector.
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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |