US3420150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighthouse intensity exposure control lens
Assignee: Rauland Borg Corp
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Filing: 1965-05-10
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Granted: 1969-01-07
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Expires: 1985-05-10
Abstract
No abstract record available.
Inventors
- 👤 Sam H Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:40
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2272; G; G03; G03F; G03F7/00; G03F7/20; G03F7/2002; H01J9/2273
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN AN EXPOSURE CHAMBER HAVING A REFERENCE AXIS, MEANS FOR SUPPORTING THE SCREEN SECTION OF A COLOR CATHODE-RAY TUBE AND AN ASSIGNED APERTURE MASK TRANSVERSELY OF SAID AXIS, AND AN OPTICAL SYSTEM, INCLUDING A LIGHT SOURCE HAVING A NONUNIFORM INTENSITY DISTRIBUTION PATTERN IN A PLANE TRANSVERSE TO SAID AXIS, FOR EXPOSING SAID SCREEN SECTION THROUGH SAID MASK, THE IMPROVEMENT WHICH COMPRISES A LENS ELEMENT OF A MATERIAL WHICH IS ABSORPTIVE AT THE WAVELENGTHS OF LIGHT FROM SAID SOURCE, SAID LENS ELEMENT HAVING A THICKNESS VARIATION TO COMPENSATE FOR THE NONUNIFORMITY OF SAID DISTRIBUTION PATTERN AND BEING INCLUDED IN SAID OPTICAL SYSTEM TO EFFECTIVELY CONSTITUTE ONE COMPONENT OF A PLANE-PARALLEL OPTICAL MEMBER WHICH CONTRIBUTES NEGLIGIBLE REFRACTION AND SPHERICAL ABERRATION EFFECTS TO SAID OPTICAL SYSTEM.
Claim 2
Dependent Claim
123 words
IN AN EXPOSURE CHAMBER HAVING A REFERENCE AXIS, MEANS FOR SUPPORTING THE SCREEN SECTION OF A COLOR CATHODE-RAY TUBE AND AN ASSIGNED APERTURE MASK TRANSVERSELY OF SAID AXIS, AND AN OPTICAL SYSTEM, INCLUDING A LIGHT SOURCE HAVING A NONUNIFORM INTENSITY DISTRIBUTION PATTERN IN A PLANE TRANSVERSE TO SAID AXIS, FOR EXPOSING SAID SCREEN SECTION THROUGH SAID MASK, THE IMPROVEMENT WHICH COMPRISES A LENS ELEMENT OF A MATERIAL WHICH IS ABSORPTIVE AT THE WAVELENGTHS OF LIGHT FROM SAID SOURCE, SAID LENS ELEMENT HAVING A THICKNESS VARIATION TO COMPENSATE FOR THE NONUNIFORMITY OF SAID DISTRIBUTION PATTERN AND BEING INCLUDED IN SAID OPTICAL SYSTEM TO EFFECTIVELY CONSTITUTE ONE COMPONENT OF A PLANE-PARALLEL OPTICAL MEMBER WHICH CONTRIBUTES NEGLIGIBLE REFRACTION AND SPHERICAL ABERRATION EFFECTS TO SAID OPTICAL SYSTEM.
References Cited (Backward Citations)
US3279340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |