Patent US3658545A successfully refreshed from Google Patents.
US3658545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive silver halide color photographic material containing cyan couplers
Assignee: Konica Minolta Inc
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Filing: 1969-12-19
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Granted: 1972-04-25
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Expires: 1989-12-19
Abstract
Abstract New colored cyan couplers useful in color photography can be obtained by substitution of a cyan coupler of the 1-hydroxy-2naphtamide type at its 4-position with a particular new arylazo group. These colored cyan couplers provide light-sensitive silver halide color-photographic material, which exhibits high photographic speed and which is free from color tone deviation over a wide pH range.
Inventors
- 👤 Masakuni Iwama
- 👤 Mitsuto Fujiwara
- 👤 Tamotsu Kojima
- 👤 Hiroyuki Imamura
- 👤 Toshihiko Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:35
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/333; G03C7/3335
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
18 words
A light-sensitive silver halide color photographic emulsion which contains as cyan color coupler a compound 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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |