US4699868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic tanning developer formulation
Assignee: 3M Co
•
Filing: 1986-08-18
•
Granted: 1987-10-13
•
Expires: 2006-08-18
Abstract
Abstract An alkaline aqueous tanning developing solution for photographic image development comprising at least one hydroxylamine derivative. Preferred formulations may also contain at least one water-miscible polyhydroxy aliphatic organic solvent and/or a developing agent which comprises a polyhydroxybenzene compound having at least two hydroxy groups and at least one electron withdrawing and good leaving group suitable for nucleophilic addition.
Inventors
- 👤 Gebran J. Sabongi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:02
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315; G03C1/00; G03C1/005; G03C1/06; G03C1/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
A tanning developer solution suitable for forming tanned images in an exposed silver halide gelatin emulsion layer in an imagewise fashion wherein said developer solution is an aqueous alkaline solution substantially free of sulfite and comprising; at least one soluble hydroxylamine derivative which is capable of reducing or eliminating air-induced non-imagewise hardening of said gelatin, said hydroxylamine derivative having the general formula: R.sub.1 (R.sub.2)NOR.sub.3, wherein R 1 and R 3 , which may be the same or different, are a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a heterocyclic group; and R 2 is R 4 CO-, wherein R 4 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, or a heterocyclic group.
Claim 2
Dependent Claim
146 words
A tanning developer solution suitable for forming tanned images in an exposed silver halide gelatin emulsion layer in an imagewise fashion wherein said developer solution is an aqueous alkaline solution substantially free of sulfite and comprising; at least one soluble hydroxylamine derivative which is capable of reducing or eliminating air-induced non-imagewise hardening of said gelatin, said hydroxylamine derivative having the general formula: R.sub.1 (R.sub.2)NOR.sub.3, wherein R 1 and R 3 , which may be the same or different, are a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a heterocyclic group; and R 2 is R 4 CO-, wherein R 4 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, or a heterocyclic group.
Claim 3
Dependent Claim
28 words
A tanning developer solution as defined in claim 1 wherein R 1 and R 3 are hydrogen atoms and R 4 is a substituted or unsubstituted amino group.
Claim 4
Dependent Claim
17 words
A tanning developer solution as defined in claim 1 further comprising at least one polyhydroxy water-miscible solvent.
Claim 5
Dependent Claim
84 words
A tanning developer solution suitable for forming tanned images in an exposed silver halide gelatin emulsion layer in an imagewise fashion wherein said developer solution is an aqueous alkaline solution substantially free of sulfite and comprising; at least one soluble hydroxylamine derivative which is capable of reducing or eliminating air-induced non-imagewise hardening of said gelatin; and a developing agent which comprises a polyhydroxybenzene derivative having at least two hydroxy groups and at least one electron withdrawing and good leaving group suitable for nucleophilic addition.
Claim 6
Dependent Claim
84 words
A tanning developer solution suitable for forming tanned images in an exposed silver halide gelatin emulsion layer in an imagewise fashion wherein said developer solution is an aqueous alkaline solution substantially free of sulfite and comprising; at least one soluble hydroxylamine derivative which is capable of reducing or eliminating air-induced non-imagewise hardening of said gelatin; and a developing agent which comprises a polyhydroxybenzene derivative having at least two hydroxy groups and at least one electron withdrawing and good leaving group suitable for nucleophilic addition.
Claim 7
Dependent Claim
28 words
A tanning developer solution as defined in claim 4 wherein said electron withdrawing and good leaving group is a halide, cyano, nitro, carboxyl, carboxyl ester, ester, or alkoxyl.
Claim 8
Dependent Claim
15 words
A tanning developer solution as defined in claim 4 wherein said developing agent is tetrahalohydroquinone.
Claim 9
Dependent Claim
15 words
A tanning developer solution as defined in claim 6 wherein said developing agent is tetrachloro-1,4-hydroquinone.
Claim 10
Dependent Claim
97 words
A tanning developer solution as defined in claim 4 wherein said hydroxylamine derivative has the general formula: R.sub.1 (R.sub.2) NOR.sub.3, wherein R 1 and R 2 , which may be the same or different, are a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, substituted or unsubstituted aryl group, or a heterocyclic group, or are in combination and derive a heterocyclic ring structure; and R 3 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, substituted or unsubstituted aryl group, or a heterocyclic group.
Claim 11
Dependent Claim
99 words
A tanning developer solution as defined in claim 4 wherein said hydroxylamine derivative has the general formula: R.sub.1 (R.sub.2)NOR.sub.3, wherein R 1 and R 3 , which may be the same or different, are a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a heterocyclic group; and R 2 is R 4 CO-, wherein R 4 is a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, or a heterocyclic group.
Claim 12
Dependent Claim
17 words
A tanning developer solution as defined in claim 4 further comprising at least one polyhydroxy water-miscible solvent.
References Cited (Backward Citations)
US1516161A
Cited
US1663959A
Cited
GB560371A
Cited
US2404774A
Cited
US2415666A
Cited
US2837430A
Cited
US2967772A
Cited
US3293035A
Cited
US3364024A
Cited
US3287125A
Cited
US3287124A
Cited
US3440049A
Cited
US3723119A
Cited
US3806345A
Cited
US3746544A
Cited
US3772022A
Cited
US3847618A
Cited
US3984243A
Cited
US4055426A
Cited
US4233393A
Cited
US4155763A
Cited
US4170478A
Cited
US4254210A
Cited
GB2026186A
Cited
US4233392A
Cited
US4283479A
Cited
US4299909A
Cited
GB2060921A
Cited
US4269929A
Cited
GB2072174A
Cited
GB2075496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |