US2742833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically sensitized prescreened photographic material
Assignee: Eastman Kodak Co
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Filing: 1951-06-29
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Granted: 1956-04-24
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Expires: 1971-06-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Evans
- 👤 Robert E Stauffer
- 👤 Henry C Yutzy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:39
CPC Classifications
G; G03; G03F; G03F5/00; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PHOTOGRAPHIC HALFTONE MATERIAL COMPRISING A FLAT SUPPORT AND A PHOTOSENSITIVE SILVER HALIDE EMULSION LAYER ON THE SUPPORT WITH A HALFTONE PATTERN OF SQUARE ELEMENTAL AREAS JUXTAPOSED WITH NO INTERVENING AREAS, SAID SQUARE ELEMENTAL AREAS HAVING A RATIO OF GREEN TO BLUE SENSITIVITY GREATER AT THE CENTERS THAN AT THE CORNERS, AND HAVING SUBSTANTIALLY UNIFORM SENSITIVITY TO BLUE LIGHT THROUGHOUT.
Claim 2
Dependent Claim
60 words
A PHOTOGRAPHIC HALFTONE MATERIAL COMPRISING A FLAT SUPPORT AND A PHOTOSENSITIVE SILVER HALIDE EMULSION LAYER ON THE SUPPORT WITH A HALFTONE PATTERN OF SQUARE ELEMENTAL AREAS JUXTAPOSED WITH NO INTERVENING AREAS, SAID SQUARE ELEMENTAL AREAS HAVING A RATIO OF GREEN TO BLUE SENSITIVITY GREATER AT THE CENTERS THAN AT THE CORNERS, AND HAVING SUBSTANTIALLY UNIFORM SENSITIVITY TO BLUE LIGHT THROUGHOUT.
References Cited (Backward Citations)
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GB250770A
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US1918208A
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Cited
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Cited
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Cited
FR937885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |