US3970375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light equalizer
Assignee: ERT Inc
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Filing: 1974-12-09
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Granted: 1976-07-20
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Expires: 1994-12-09
Abstract
Abstract A light equalizer having an output aperture across which each area element exhibits substantially the same emission intensity regardless of the distribution of light into the input aperture of the equalizer. The equalizer is embodied in a stack of a plurality of transmissive elements, a number of which provide a multiplicity of light scattering centers. The exterior surface of the equalizer is covered with an internally reflective coating except for the input and output apertures.
Inventors
- 👤 Henry H. Blau, Jr.
- 👤 Paul L. Kebabian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:52
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/09; G02B27/0938; G02B27/0994; G01; G01J; G01J3/00; G01J3/02; G01J3/0205; G01J3/0208; G02B27/0927; G02B27/30; G02B27/40; G02B5/00; G02B5/20; G02B5/22; G02B5/24; G02B5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A light equalizer for providing substantially uniform distribution of light within a spectral region of interest across an output aperture, said equalizer having an enclosure having opposite ends transparent to said light, a body of fluid disposed in said enclosure and being transparent to said light, a plurality of minute particles distributed in said fluid and being transparent to said light, said particles and said fluid having different indices of refraction with respect to said light within said spectral region; and internally wholly reflective means disposed about the entire exterior of said enclosure except for said opposite ends.
Claim 2
Dependent Claim
98 words
A light equalizer for providing substantially uniform distribution of light within a spectral region of interest across an output aperture, said equalizer having an enclosure having opposite ends transparent to said light, a body of fluid disposed in said enclosure and being transparent to said light, a plurality of minute particles distributed in said fluid and being transparent to said light, said particles and said fluid having different indices of refraction with respect to said light within said spectral region; and internally wholly reflective means disposed about the entire exterior of said enclosure except for said opposite ends.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |