US2865744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescence in photographic emulsions and duplicating process using such fluorescence
Assignee: GAF Chemicals Corp
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Filing: 1956-01-26
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Granted: 1958-12-23
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Friedman
- 👤 Horwitz Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:03
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/08; G03C5/10; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/76; G03C1/815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS OF PREPARING A DIRECT DUPLICATE FROM A TRANSPARENT ORIGINAL WHICH COMPRISES EXPOSING THROUGH SAID ORIGINAL WITH BLUE LIGHT A PHOTOGRAPHIC MATERIAL CARRYING ON A TRANSPARENT SUPPORT A SILVER HALIDE EMULSION CONTAINING A SENSITIZING DYE CAPABLE OF INCREASING THE FLUORESCENCE OF SAID EMULSION, FOR A TIME IN EXCESS OF THAT REQUIRED FOR THE FORMATION OF A LATENT IMAGE AND SUFFICINET TO DESTROY IN THE HEAVILY EXPOSED AREAS THE ABILITY TO FLUORESCE WITHOUT AFFECTING THE ABILITY TO FLUORESCE IN THE AREAS OF LOW EXPOSURE, REMOVING SAID ORIGINAL, EXPOSING WITH BLUE LIGHT THROUGH SAID EXPOSED INTERMEDIATE PRINTING
Claim 2
Dependent Claim
96 words
A PROCESS OF PREPARING A DIRECT DUPLICATE FROM A TRANSPARENT ORIGINAL WHICH COMPRISES EXPOSING THROUGH SAID ORIGINAL WITH BLUE LIGHT A PHOTOGRAPHIC MATERIAL CARRYING ON A TRANSPARENT SUPPORT A SILVER HALIDE EMULSION CONTAINING A SENSITIZING DYE CAPABLE OF INCREASING THE FLUORESCENCE OF SAID EMULSION, FOR A TIME IN EXCESS OF THAT REQUIRED FOR THE FORMATION OF A LATENT IMAGE AND SUFFICINET TO DESTROY IN THE HEAVILY EXPOSED AREAS THE ABILITY TO FLUORESCE WITHOUT AFFECTING THE ABILITY TO FLUORESCE IN THE AREAS OF LOW EXPOSURE, REMOVING SAID ORIGINAL, EXPOSING WITH BLUE LIGHT THROUGH SAID EXPOSED INTERMEDIATE PRINTING
References Cited (Backward Citations)
US2331492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |