US2950972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions having increased sensitivity to x-ray and gamma ray radiation
Assignee: GAF Chemicals Corp
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Filing: 1954-11-24
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Granted: 1960-08-30
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Expires: 1974-11-24
Abstract
No abstract record available.
Inventors
- 👤 Fritz W H Mueller
- 👤 Jr Ernest T Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C5/00; G03C5/16; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A PROCESS OF PREPARING A PHOTOGRAPHIC SILVER HALIDE EMULSION IN WHICH THE SILVER HALIDE IS PREDOMINANTLY SILVER BROMIDE, AND WHEREIN SAID PROCESS INCLUDES REACTING A SILVER NITRATE SOLUTION WITH AN ALKALI METAL HALIDE SOLUTION IN THE PRESENCE OF A DISSOLVED COLLOIDAL CARRIER MATERIAL SO AS TO FORM A DISPERSION OF SILVER HALIDE GRAINS IN SAID COLLOIDAL CARRIER MATERIAL, THE IMPROVEMENT WHICH COMPRISES INCREASING THE SENSITIVITY OF SAID EMULSION TO X-RAY AND GAMMA RAY RADIANTION BY MIXING SAID TWO SOLUTIONS IN THE PRESENCE OF A CADMIUM SALT SELECTED FROM THE GROUP CONSISTING OF CADMIUM CHLORIDE, CADMIUM BROMIDE, CADMIUM NITRATE AND CADMIUM ACETATE, THE CONCENTRATION OF THE CADMIUM SALT RANGING FROM 0.001 TO 0.2 MOLE PERCENT OF CADMIUM ION PER MOLE OF SILVER ION USED IN THE PREPARATION OF THE EMULSION.
Claim 2
Dependent Claim
130 words
IN A PROCESS OF PREPARING A PHOTOGRAPHIC SILVER HALIDE EMULSION IN WHICH THE SILVER HALIDE IS PREDOMINANTLY SILVER BROMIDE, AND WHEREIN SAID PROCESS INCLUDES REACTING A SILVER NITRATE SOLUTION WITH AN ALKALI METAL HALIDE SOLUTION IN THE PRESENCE OF A DISSOLVED COLLOIDAL CARRIER MATERIAL SO AS TO FORM A DISPERSION OF SILVER HALIDE GRAINS IN SAID COLLOIDAL CARRIER MATERIAL, THE IMPROVEMENT WHICH COMPRISES INCREASING THE SENSITIVITY OF SAID EMULSION TO X-RAY AND GAMMA RAY RADIANTION BY MIXING SAID TWO SOLUTIONS IN THE PRESENCE OF A CADMIUM SALT SELECTED FROM THE GROUP CONSISTING OF CADMIUM CHLORIDE, CADMIUM BROMIDE, CADMIUM NITRATE AND CADMIUM ACETATE, THE CONCENTRATION OF THE CADMIUM SALT RANGING FROM 0.001 TO 0.2 MOLE PERCENT OF CADMIUM ION PER MOLE OF SILVER ION USED IN THE PREPARATION OF THE EMULSION.
References Cited (Backward Citations)
GB108193A
Cited
US2399083A
Cited
US2432865A
Cited
US2618556A
Cited
US2598079A
Cited
US2768079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |