Patent US3881936A successfully refreshed from Google Patents.
US3881936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic emulsion containing three sensitizing dyes
Assignee: Fujifilm Holdings Corp
•
Filing: 1974-01-23
•
Granted: 1975-05-06
•
Expires: 1994-01-23
Abstract
Abstract Silver halide photographic emulsions which contain at least one green-sensitive sensitizing dye or one red-sensitive sensitizing dye in combination with at least one blue-sensitive apomerocyanine dye giving their maximum sensitization in the range of 430 to 530 m Mu is disclosed.
Inventors
- 👤 Yoshihide Hayakawa
- 👤 Masaji Yoshida
- 👤 Yoshiyuki Nakazawa
- 👤 Yashuharu Nakamura
- 👤 Akira Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28; G03C1/29
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A BLACK-AND-WHITE SILVER HALIDE EMULSION SUITABLE FOR A THREE-COLOR SEPARATION PROCESS, HAVING THE IMPROVED BLUE-TOGREEN AND RED-TO-GREEN GAMMA BALANCE, WHICH CONTAINS AT LEAST ONE SENSITIZING DYE REPRESENTED BY FORMULA II AND AT LEAST ONE SENSITIZING DYE REPRESENTED BY FORMULA III IN COMBINATION WITH AT LEAST ONE OPEMEROCYANINE DYE REPRESENTED BY THE FORMULA I: FORMULA (II):
Claim 2
Dependent Claim
55 words
A BLACK-AND-WHITE SILVER HALIDE EMULSION SUITABLE FOR A THREE-COLOR SEPARATION PROCESS, HAVING THE IMPROVED BLUE-TOGREEN AND RED-TO-GREEN GAMMA BALANCE, WHICH CONTAINS AT LEAST ONE SENSITIZING DYE REPRESENTED BY FORMULA II AND AT LEAST ONE SENSITIZING DYE REPRESENTED BY FORMULA III IN COMBINATION WITH AT LEAST ONE OPEMEROCYANINE DYE REPRESENTED BY THE FORMULA I: FORMULA (II):
Claim 3
Dependent Claim
80 words
The silver halide photographic emulsion of claim 1, wherein Z3 of Formula II represents the group of atoms necessary to form a benzothiazole nucleus, a benzoselenazole nucleus or a 2-quinoline nucleus, A represents a lower alkyl group, Z4 and Z5 of Formula III each represents the group of atoms necessary to form a benzothiazole nucleus or a benzoselenazole nucleus, said benzothiazole nucleus or said benzoselenazole nucleus being unsubstituted or substituted by at least one lower alkyl group or halogen atom.
Claim 4
Dependent Claim
37 words
Silver halide photographic emulsion as claimed in claim 1 wherein the total amount of the blue-sensitive sensitizing dyes added is from 1 X 10 5 to 8 X 10 4 moles per one mole of silver halide.
Claim 5
Dependent Claim
29 words
Silver halide photographic emulsion as claimed in claim 1 wherein at least one of the green-sensitive sensitizing dye and the red-sensitive sensitizing dye is one which easily forms J-aggregation.
Claim 6
Dependent Claim
19 words
Silver halide photographic emulsion as claimed in claim 1 wherein the silver halide is silver bromoiodide or silver chlorobromoiodide.
Claim 7
Dependent Claim
19 words
A photographic sensitive material comprising an emulsion layer containing a silver halide photographic emulsion as claimed in claim 1.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |