Patent US2522802A successfully refreshed from Google Patents.
US2522802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of yellow dye images by color development
Assignee: GAF Chemicals Corp
•
Filing: 1948-12-22
•
Granted: 1950-09-19
•
Expires: 1968-12-22
Abstract
No abstract record available.
Inventors
- 👤 Donald E Sargent
- 👤 Robert C Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:30
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3244
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE PROCESS OF PRODUCING YELLOW DYE IMAGES WHICH ARE RESISTANT TO SPLITTING BY STRONG MINERAL ACIDS, WHICH COMPRISES DEVELOPING A DEVELOPABLE SILVER HALIDE EMULSION IN THE PRESENCE OF AN OPEN CHAIN KETO METHYLENE COMPOUND WITH A 2.4-DIAMINO-ANILINE IN WHICH THE NITROGEN ATOMS IN 2AND 4-POSITIONS HAVE DIRECTLY LINKED THERETO A CARBON ATOM OF A RADICAL SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC AND AROMATIC RADICALS, BLEACHING AND FIXING SAID EMULSION, AND ADJUSTING THE PH OF THE EMULSION IN A FINAL PHASE OF THE PROCESSING OPERATION BY TREATMENT WITH AN ALKALI UNTIL THE YELLOW IMAGE MANIFESTS ITSELF WHEN THE EMULSION HAS BEEN PREVIOUSLY SUBJECTED TO AN ACIDIC TREATING BATH.
Claim 2
Dependent Claim
108 words
THE PROCESS OF PRODUCING YELLOW DYE IMAGES WHICH ARE RESISTANT TO SPLITTING BY STRONG MINERAL ACIDS, WHICH COMPRISES DEVELOPING A DEVELOPABLE SILVER HALIDE EMULSION IN THE PRESENCE OF AN OPEN CHAIN KETO METHYLENE COMPOUND WITH A 2.4-DIAMINO-ANILINE IN WHICH THE NITROGEN ATOMS IN 2AND 4-POSITIONS HAVE DIRECTLY LINKED THERETO A CARBON ATOM OF A RADICAL SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC AND AROMATIC RADICALS, BLEACHING AND FIXING SAID EMULSION, AND ADJUSTING THE PH OF THE EMULSION IN A FINAL PHASE OF THE PROCESSING OPERATION BY TREATMENT WITH AN ALKALI UNTIL THE YELLOW IMAGE MANIFESTS ITSELF WHEN THE EMULSION HAS BEEN PREVIOUSLY SUBJECTED TO AN ACIDIC TREATING BATH.
References Cited (Backward Citations)
US2414491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |