US4814960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glare control
Assignee: Individual
•
Filing: 1986-05-14
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Granted: 1989-03-21
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Expires: 2006-05-14
Abstract
Abstract Micro-irregularities on a surface that interacts with (transmits or reflects) illumination from a light source are effective to control glare perceived by a viewer in the light path projected from the source, while maintaining effective energy and directionality of the projected light. Preferably the micro-irregularities are created by liquid dispersion comprising organic polymeric particles and allowing the coating to dry.
Inventors
- 👤 P. Dong-Guang Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:05
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/22; F21V3/00; F21V3/04; G; G02; G02B; G02B5/00; G02B5/12; G02B5/126; G02B5/128
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A method of reducing glare from an illumination device comprising a light source positioned to provide illumination that interacts with an optical glass surface, said device providing illumination projected in a light path, said method comprising, by controlled etching of said glass, creating over all of said optical glass surface, micro-irregularities to control dispersion of said projected illumination, said micro-irregularities effectively maintaining the directionality and average intensity of the projected illumination.
Claim 2
Independent Claim
71 words
A method of reducing glare from an illumination device comprising a light source positioned to provide illumination that interacts with an optical glass surface, said device providing illumination projected in a light path, said method comprising, by controlled etching of said glass, creating over all of said optical glass surface, micro-irregularities to control dispersion of said projected illumination, said micro-irregularities effectively maintaining the directionality and average intensity of the projected illumination.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said micro-irregularities are effective to increase light diffusion at said surface by a factor of 500-99,500.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said micro-irregularities substantially maintain the solid angle of said directed illumination.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein said illumination device comprises a light bulb, and said optical surface is the exterior bulb surface.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein said illumination device comprises a light bulb, and said optical surface is a lens or mirror directing illumination from said bulb in said light path.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said illumination device is an automobile headlight.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein said illumination device is light source is positioned and designed to illuminate a stadium or a street.
Claim 9
Dependent Claim
27 words
The method of claim 1 wherein said illumination device is light source is positioned on an aircraft landing field designed to guide aircraft during landing or take-off.
Claim 10
Dependent Claim
29 words
The method of claim 1 wherein the micro-irregularities are created, and an inert coating is applied over the micro-irregularities and subsequently removed to control the amount of dispersion achieved.
References Cited (Backward Citations)
US727495A
Cited
US1230670A
Cited
GB262898A
Cited
US1926732A
Cited
US1917612A
Cited
US2245137A
Cited
US2280489A
Cited
US3490982A
Cited
US3551228A
Cited
US3909649A
Cited
US4114983A
Cited
US4586116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |