US5228767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headlight lens with external light sensitivity
Assignee: Individual
•
Filing: 1992-03-24
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Granted: 1993-07-20
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Expires: 2012-03-24
Abstract
Abstract A headlight lens is fabricated from photochromic glass so that the headlight is not noticeable during daylight hours when subjected to ultraviolet light. At night, in the absence of ultraviolet light, the lens is transparent and emits the light from inside the headlight.
Inventors
- 👤 Michael B. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:16
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; B; B60; B60Q; B60Q1/00; B60Q1/02; B60Q1/04; F; F21; F21S; F21S41/00; F21S41/10; F21S41/12; F21S41/13; F21S41/20; F21S41/28; F21S41/285; F21S41/30; F21S41/32; F21S41/321; F21S41/323
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
55 words
A headlight comprising a source of illumination and an envelope surrounding said source of illumination, said envelope including a lens for receiving the light from said light source, said lens comprising a photochromic sheet means that is optically transparent in the absence of sunlight, said sheet means exhibiting a darkened appearance when exposed to sunlight.
Claim 2
Dependent Claim
55 words
A headlight comprising a source of illumination and an envelope surrounding said source of illumination, said envelope including a lens for receiving the light from said light source, said lens comprising a photochromic sheet means that is optically transparent in the absence of sunlight, said sheet means exhibiting a darkened appearance when exposed to sunlight.
Claim 3
Dependent Claim
26 words
The headlight of claim 1 wherein said lens exhibits a pigmentation such that a particular color is provided when the lens is in its darkened state.
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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) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |