US2828203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing clayden desensitization of photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1954-06-29
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Granted: 1958-03-25
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Expires: 1974-06-29
Abstract
No abstract record available.
Inventors
- 👤 Edgar A Macwilliam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/36; G03C1/08; G03C1/10; G03C1/12; G03C1/22; G03C1/485; G03C1/48592; Y; Y10; Y10S; Y10S430/00; Y10S430/141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
THE METHOD OF OBTAINING A DIRECT-POSITIVE IMAGE IN A SILVER HALIDE EMULSION LAYER, WHICH COMPRISED IMAGEWISE EXPOSING TO A HIGH INTENSITY SHORT DURATION FLASH OF SUFFICIENT INTENSITY AND SUFFICIENTLY SHORT DURATION TO PRODUCE A CLAYDEN DESENSITATIZATION A SILVER HALIDE EMULSION WHICH WHEN EXPOSED UNDER A STEP TABLE HAVING 28 STEPS STARTING WITH APPROXIMATELY ZERO DENSITY AND INCREASING IN INTERVALS OF 0.3 DENSITY, TO A LIGHT FROM A HIGH INTENSITY FLASH LAMP HAVING 18.000 LUMEN SECONDS OUTPUT IN .0005 SECOND, TO FEET FROM THE EMULSION, AND AGAIN EXPOSED WITH THE STEP TABLET ROTATED 90*, TO LOW INTENSITY LIGHT FROM A 1000 WATT TUNGSTEN LAMP 2 FEET FROM THE EMULSION FOR 2 MINUTES, SHOWS AT LEAST 0.10 LOG E DECREASE IN DENSITY BETWEEN AN AREA RECEIVING ONLY LOW INTENSITY EXPOSURE AND AN AREA RECEIVING THE SAME LEVEL OF LOW IN TENSITY EXPOSURE PLUS SOME LEVEL OF IGH INTENSITY EXPOSURE, WHEN DEVELOPED FOR 2 1/4 MINUTES AT 68*F. IN A DEVELOPER OF THE FOLLOWING COMPOSITION:
Claim 2
Independent Claim
162 words
THE METHOD OF OBTAINING A DIRECT-POSITIVE IMAGE IN A SILVER HALIDE EMULSION LAYER, WHICH COMPRISED IMAGEWISE EXPOSING TO A HIGH INTENSITY SHORT DURATION FLASH OF SUFFICIENT INTENSITY AND SUFFICIENTLY SHORT DURATION TO PRODUCE A CLAYDEN DESENSITATIZATION A SILVER HALIDE EMULSION WHICH WHEN EXPOSED UNDER A STEP TABLE HAVING 28 STEPS STARTING WITH APPROXIMATELY ZERO DENSITY AND INCREASING IN INTERVALS OF 0.3 DENSITY, TO A LIGHT FROM A HIGH INTENSITY FLASH LAMP HAVING 18.000 LUMEN SECONDS OUTPUT IN .0005 SECOND, TO FEET FROM THE EMULSION, AND AGAIN EXPOSED WITH THE STEP TABLET ROTATED 90*, TO LOW INTENSITY LIGHT FROM A 1000 WATT TUNGSTEN LAMP 2 FEET FROM THE EMULSION FOR 2 MINUTES, SHOWS AT LEAST 0.10 LOG E DECREASE IN DENSITY BETWEEN AN AREA RECEIVING ONLY LOW INTENSITY EXPOSURE AND AN AREA RECEIVING THE SAME LEVEL OF LOW IN TENSITY EXPOSURE PLUS SOME LEVEL OF IGH INTENSITY EXPOSURE, WHEN DEVELOPED FOR 2 1/4 MINUTES AT 68*F. IN A DEVELOPER OF THE FOLLOWING COMPOSITION:
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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |