US2647054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions containing sensitizing dyes
Assignee: EIDP Inc
•
Filing: 1951-02-21
•
Granted: 1953-07-28
•
Expires: 1971-02-21
Abstract
No abstract record available.
Inventors
- 👤 Vinton William Howells
- 👤 Firestine John Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A LIGHT-SENSITIVE SILVER HALIDE EMULSION CONTAINING A COMPOUND HAVING THE GENERAL FORMUAL: WHERE R IS AN ALKYL RADICAL, R'' IS AN ALKYL RADICAL OF 1 TO 4 CARBON ATOMS, X IS THE NEGATIVE RADICAL OF AN ACID AND Y CONSTITUTES THE ATOMS NECESSARY TO COMPLETE A HETEROCYCLIC NITROGEN RADICAL TAKEN FROM THE GROUP CONSISTING OF THIAZOLINE, BENZOXAZOLE, BENZOSELENAZOLE, NAPHTHOSELENAZOLE AND THIAZOLE, BENZOSELENAZOLE, NAPHTHOSELENAZOLE AND DIMETHYLINDOLENINE AND SUCH RADICALS WHEREIN THE BENZENE RINGS ARE SUBSTITUTED BY AT LEAST ONE ALKYL GROUP OF 1 TO 3 CARBON ATOMS.
Claim 2
Dependent Claim
86 words
A LIGHT-SENSITIVE SILVER HALIDE EMULSION CONTAINING A COMPOUND HAVING THE GENERAL FORMUAL: WHERE R IS AN ALKYL RADICAL, R'' IS AN ALKYL RADICAL OF 1 TO 4 CARBON ATOMS, X IS THE NEGATIVE RADICAL OF AN ACID AND Y CONSTITUTES THE ATOMS NECESSARY TO COMPLETE A HETEROCYCLIC NITROGEN RADICAL TAKEN FROM THE GROUP CONSISTING OF THIAZOLINE, BENZOXAZOLE, BENZOSELENAZOLE, NAPHTHOSELENAZOLE AND THIAZOLE, BENZOSELENAZOLE, NAPHTHOSELENAZOLE AND DIMETHYLINDOLENINE AND SUCH RADICALS WHEREIN THE BENZENE RINGS ARE SUBSTITUTED BY AT LEAST ONE ALKYL GROUP OF 1 TO 3 CARBON ATOMS.
References Cited (Backward Citations)
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US2166736A
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US2263749A
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US2320654A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |