US3718476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide element containing merocyanine dyes with a 3-pyrrolinylalkyl group
Assignee: Eastman Kodak Co
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Filing: 1970-10-23
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Granted: 1973-02-27
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Expires: 1990-10-23
Abstract
Abstract Novel merocyanine dyes of which the acid nucleus, such as a rhodanine nucleus, has a 3-pyrrolinylalkyl group attached thereto. The dyes are spectral sensitizers for silver halide photographic emulsions and also increase the blue sensitivity of the silver halide. Intermediates for these dyes are novel cyanoalkyl-3-pyrrolines and aminoalkyl-3-pyrrolines.
Inventors
- 👤 A Fumia
- 👤 D Heseltine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:43
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; C09B23/105; C09B23/107; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
15 words
A photographic element according to claim 1, wherein X is sulfur and y is 3.
Claim 2
Dependent Claim
15 words
A photographic element according to claim 1 in which said dye is of the formula
Claim 3
Dependent Claim
15 words
A photographic element according to claim 1 in which said dye is of the formula
Claim 4
Dependent Claim
15 words
A photographic element according to claim 1 in which said dye is of the formula
Claim 5
Dependent Claim
15 words
A photographic element according to claim 1 in which said dye is of the formula
Claim 6
Dependent Claim
15 words
A photographic element according to claim 1 in which said dye is of the formula
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |