US3615549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic paper which produces warm-toned image color and method of making it
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1969-10-10
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Granted: 1971-10-26
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Expires: 1989-10-10
Abstract
Abstract Process for the manufacture of a silver halide photographic paper which produces warm-toned image of from olive-brown to brown-black when developed and the tone of which is endurable against hot-drying of the finished print by employing two compounds having the following formulae:
Inventors
- 👤 Yasushi Ohyama
- 👤 Kiyoshi Futaki
- 👤 Senji Tosa
- 👤 Yaichi Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:28
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/35; G03C1/355
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
A silver halide photographic paper with warm-toned image color endurable against hot-drying, manufactured by a process according to claim 1.
Claim 2
Dependent Claim
32 words
A process for the manufacture of a silver halide photographic paper according to claim 1, wherein N-methyl benzoxazoline-2-thione or the derivatives of it is used at the first stage of emulsion making.
Claim 3
Dependent Claim
31 words
A process for the manufacture of a silver halide photographic paper according to claim 1, wherein N-methyl-benzothiazoline-2-thione or the derivatives of it is used at the first stage of emulsion making.
Claim 4
Dependent Claim
31 words
A process for the manufacture of a silver halide photographic paper according to claim 1, wherein N,N''-dimethyl-benzimidazoline-2-thione or the derivatives of it is used at the first stage of emulsion making.
Claim 5
Dependent Claim
34 words
A process of the manufacture of a silver halide photographic paper according to claim 1, wherein N-methyl-1,2-dihydroquinoline-2-thione or the derivatives of it is added to the emulsion at the first stage of emulsion making.
Claim 6
Dependent Claim
29 words
A process of the manufacture of a silver halide photographic paper according to claim 1, wherein 1,5-diphenyl-S-triazolidino(1,2a)-S-triazolidine-3,7-dithione is added to the emulsion at the last stage of emulsion making.
Claim 7
Dependent Claim
29 words
A process of the manufacture of a silver halide photographic paper according to claim 1, wherein 1,5-diheptyl-S-triazolidino(1,2a)-S-triazolidine-3,7-dithione is added to the emulsion at the last stage of emulsion making.
Claim 8
Dependent Claim
29 words
A process of the manufacture of a silver halide photographic paper according to claim 1, wherein 1,5-dipentyl-S-triazolidino(1,2a)-S-triazolidine-3,7-dithione is added to the emulsion at the last stage of emulsion making.
Claim 9
Dependent Claim
29 words
A process for the manufacture of a silver halide photographic paper according to claim 1, wherein 1,5-dihexyl-S-triazolidino(1,2a)-S-triazolidine-3,7-dithione is added to the emulsion at the last stage of emulsion making.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |