US3833802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle optical system for uniform planar illumination
Assignee: General Electric Co
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Filing: 1972-05-15
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Granted: 1974-09-03
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Expires: 1992-05-15
Abstract
Abstract A COMPACT SYSTEM PROVIDING UNIFORM ILLUMINATION OF A PLANE BY MEANS OF A COMPACT SOURCE AND A CORRECTING OPTICAL SYSTEM. THE ILLUMINATION FROM A POINT SOURCE BY ITSELF IS PROPORTIONAL TO THE COSINE3 OF THE ANGLE WHICH A RAY FROM THE SOURCE MAKES WITH THE NORMAL TO THE PLANE. A WIDE ANGLE LENS REFRACTS RADIATION FROM THE SOURCE INTO A 90* CONE AND REDISTRIBUTES IT WITHIN THE CONE INVERSELY AS THE COSINE3 OF THE ANGLE SO THAT THE EFFEC- TIVE ILLUMINATION ON THE PLANE IS UNIFORM. THE SYSTEM IS PARTICULARLY USEFUL FOR OBTAINING UNIFORM PRINTING EXPOSURE OF PHOTOSENSITIVE PLATES IN OFFSET PRINTING.
Inventors
- 👤 E Fridrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:46
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/16; F; F21; F21V; F21V13/00; F21V13/02; F21V13/04
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |