Patent US3554755A successfully refreshed from Google Patents.
US3554755A
Expired / Lapsed
US
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Photographic emulsions containing chemical adjuvants dispersed in crystalloidal solvents
Assignee: Ferrania SpA
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Filing: 1967-11-09
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Granted: 1971-01-12
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Expires: 1987-11-09
Abstract
Abstract ORGANIC CRYSTALLOIDAL SOLVENTS OF THE FORMULA R-COO-(CH(-X))N-CH(-Y)-N(-R'')-R" WHEREIN R IS AN ALKYL RADICAL HAVING FROM 1 TO 18 CARBON ATOMS, N IS AN INTEGER UP TO 6, X AND Y INDIVIDUALLY ARE A HYDROGEN RADICAL OR AN ALKYL RADICAL, R'' IS A HYDROGEN ATOM, AN ALKYL GROUP OR THE MONOVALENT RADICAL R-COO-(CH(-X))N-CH(-Y)- WHERE R, X, Y AND N ARE AS DEFINED ABOVE; R" IS A HYDROGEN ATOM OR ACYL RADICAL HAVING FROM 1 TO 18 CARBON ATOMS. THESE CRYSTALLOIDAL SOLVENTS ARE PARTICULARLY USEFUL IN DISPERSED COUPLER PHOTOGRAPHIC LAYERS AND CONSTRUCTIONS.
Inventors
- 👤 Giancarlo Rinauro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:35
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3885; G03C1/00; G03C1/005; G03C1/06; G03C1/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |