Patent US2994610A successfully refreshed from Google Patents.
US2994610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color radiography
Assignee: Agfa Gevaert NV
•
Filing: 1957-09-04
•
Granted: 1961-08-01
•
Expires: 1977-09-04
Abstract
No abstract record available.
Inventors
- 👤 Maus Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:58
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A PROCESS FOR THE PRODUCTION OF RADIOGRAPHS WITH INVISIBLE ACTINIC RAYS WHICH COMPRISES EXPOSING TO SAID RAYS A SILVER HALIDE EMULSION LAYER CONTAINING AT LEAST TWO COLOR COUPLERS WHICH COUPLE AT DIFFERENT REACTION VELOCITIES WITH THE OXIDATION PRODUCTS OF THE SAME COLOR FORMING PRIMARY AMINE DEVELOPED TO FORM DIFFERENTLY COLORED DYE IMAGES, THE COUPLER OF HIGHER COUPLING VELOCITY BEING SELECTED FROM THE GROUP CONSISTING OF ACYLACETAMIDES, 5-PYRAZOLONES, AND ALPHA-NAPHTHOLS WHICH ARE NOT SUBSTITUTED IN PARA-POSITION TO THE PHENOLIC HYDROXY GROUP, AND THE COUPLER OF LOWER COUPLING VELOCITY BEING AN ALPHANAPHTHOL WHICH CONTAINS IN PARA-POSITION TO THE HYDROXY GROUP A SUBSTITUENT WHICH IS SPLIT OFF DURING DEVELOPMENT, SAID SUBSTITUENT BEING SELECTED FROM THE CLASS OF HALOGEN ATOM AND A SULFONIC ACID GROUP, SAID DIFFERENT REACTION VELOCITIES BEING SUCH THAT DEVELOPMENT OF SAID LAYER WITH SAID DEVELOPER FORMS A COLOR IMAGE IN WHICH THE SHADOWS HAVE DIFFERENT COLOR SHADES THAN THE HIGHLIGHTS, AND PROCESSING SAID EXPOSED MATERIAL IN SUCH A DEVELOPER TO PRODUCE A RADIOGRAPH HAVING SHADOWS WITH DIFFERENT COLOR SHADES THAN THE HIGHLIGHTS.
Claim 2
Dependent Claim
172 words
A PROCESS FOR THE PRODUCTION OF RADIOGRAPHS WITH INVISIBLE ACTINIC RAYS WHICH COMPRISES EXPOSING TO SAID RAYS A SILVER HALIDE EMULSION LAYER CONTAINING AT LEAST TWO COLOR COUPLERS WHICH COUPLE AT DIFFERENT REACTION VELOCITIES WITH THE OXIDATION PRODUCTS OF THE SAME COLOR FORMING PRIMARY AMINE DEVELOPED TO FORM DIFFERENTLY COLORED DYE IMAGES, THE COUPLER OF HIGHER COUPLING VELOCITY BEING SELECTED FROM THE GROUP CONSISTING OF ACYLACETAMIDES, 5-PYRAZOLONES, AND ALPHA-NAPHTHOLS WHICH ARE NOT SUBSTITUTED IN PARA-POSITION TO THE PHENOLIC HYDROXY GROUP, AND THE COUPLER OF LOWER COUPLING VELOCITY BEING AN ALPHANAPHTHOL WHICH CONTAINS IN PARA-POSITION TO THE HYDROXY GROUP A SUBSTITUENT WHICH IS SPLIT OFF DURING DEVELOPMENT, SAID SUBSTITUENT BEING SELECTED FROM THE CLASS OF HALOGEN ATOM AND A SULFONIC ACID GROUP, SAID DIFFERENT REACTION VELOCITIES BEING SUCH THAT DEVELOPMENT OF SAID LAYER WITH SAID DEVELOPER FORMS A COLOR IMAGE IN WHICH THE SHADOWS HAVE DIFFERENT COLOR SHADES THAN THE HIGHLIGHTS, AND PROCESSING SAID EXPOSED MATERIAL IN SUCH A DEVELOPER TO PRODUCE A RADIOGRAPH HAVING SHADOWS WITH DIFFERENT COLOR SHADES THAN THE HIGHLIGHTS.
References Cited (Backward Citations)
US2159600A
Cited
US2224329A
Cited
US2186736A
Cited
US2542716A
Cited
US2542715A
Cited
GB626979A
Cited
US2644096A
Cited
US2698794A
Cited
US2793118A
Cited
US2689793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |