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US5147767A
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Gluconic acid-based developer composition
Assignee: AUDENREID W KNAPP JR
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Filing: 1991-04-10
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Granted: 1992-09-15
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Expires: 2011-04-10
Abstract
Abstract An environmentally-safe, non-toxic non-hydroquinone and non-alkali metal hydroxide containing photographic developer composition is provided comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof, together with a sulfite, an alkali metal carbonate, and a 3-pyrzaolidone developer compound.
Inventors
- 👤 Audenried W. Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:33
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/305
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
42 words
A method of effecting development of an image-wise exposed photographic material comprising effecting development of said material while in contact with an aqueous, alkaline photographic developer composition comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof.
Claim 2
Independent Claim
42 words
A method of effecting development of an image-wise exposed photographic material comprising effecting development of said material while in contact with an aqueous, alkaline photographic developer composition comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein said composition further comprises a sulfite.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said developer further comprises an alkali metal carbonate.
Claim 5
Dependent Claim
26 words
The method of claim 1, wherein said developer is selected from the group consisting of 2-keto gluconic acid and sodium, potassium, ammonium and methyl-based derivatives thereof.
Claim 6
Dependent Claim
12 words
The method of claim 4, wherein said developer comprises methyl 2-keto gluconate.
Claim 7
Dependent Claim
12 words
The method of claim 4, wherein said developer comprises 2-keto gluconic acid.
Claim 8
Dependent Claim
27 words
The method of claim 1, wherein said composition further comprises a component selected from the group consisting of a sequestering agent, an anti-fogging agent, and mixtures thereof.
Claim 9
Dependent Claim
19 words
The method of claim 2, wherein said sulfite is selected from the group consisting of sodium and potassium sulfite.
Claim 10
Dependent Claim
13 words
The method of claim 1, wherein said composition further comprises a 3-pyrazolidone compound.
Claim 11
Dependent Claim
22 words
The method of claim 9, wherein said 3-pyrazolidone compound is selected from the group consisting of 1-phenyl-3-pyrazolidone, 1-p-tolyl-3-pyrazolidone, 1-phenyl-4-methyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, and 1-p-chlorophenyl-3-pyrazolidone.
Claim 12
Dependent Claim
19 words
The method of claim 1, wherein said composition has a pH within the range of from 9.5 to 11.75.
Claim 13
Dependent Claim
92 words
A non-hydroquinone and non-alkali metal hydroxide containing photographic developer composition comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof, together with a sulfite, an alkali metal carbonate, and a 3-pyrazolidone compound, said composition having a pH of from 9.50 to 11.75, said developer being present in an amount of at least about 15 grams, said sulfite being present in an amount of from 2 to 20 grams, and said carbonate being present in an amount of from 15 to 30 grams, and water to 1.0 liter.
Claim 14
Dependent Claim
92 words
A non-hydroquinone and non-alkali metal hydroxide containing photographic developer composition comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof, together with a sulfite, an alkali metal carbonate, and a 3-pyrazolidone compound, said composition having a pH of from 9.50 to 11.75, said developer being present in an amount of at least about 15 grams, said sulfite being present in an amount of from 2 to 20 grams, and said carbonate being present in an amount of from 15 to 30 grams, and water to 1.0 liter.
Claim 15
Dependent Claim
27 words
The developer composition of claim 12 wherein said developer is selected from the group consisting of 2-keto gluconic acid and sodium, potassium, ammonium and methyl-based derivatives thereof.
Claim 16
Dependent Claim
13 words
The developer composition of claim 12 wherein said developer comprises methyl 2-keto gluconate.
Claim 17
Dependent Claim
25 words
The photographic developer of claim 12 further comprising a component selected from the group consisting of a sequestering agent, an anti-fogging agent, and mixtures thereof.
Claim 18
Dependent Claim
20 words
The photographic developer of claim 12 wherein said sulfite is selected from the group consisting of sodium and potassium sulfite.
Claim 19
Dependent Claim
12 words
The photographic developer composition of claim 12 further comprising a sequestering agent.
Claim 20
Dependent Claim
17 words
The photographic developer composition of claim 17 wherein said sequestering agent comprises EDTA or a salt thereof.
Claim 21
Dependent Claim
24 words
The photographic developer composition of claim 12 wherein said 3-pyrazolidone compound is selected from the group consisting of 1-phenyl-3-pyrazolidone, 1-p-tolyl-3-pyrazolidone, 1-phenyl-4-methyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, and 1-p-chlorophenyl-3-pyrazolidone.
Claim 22
Dependent Claim
20 words
The photographic developer composition of claim 12 wherein said developer composition comprises 4-(hydroxymethyl)-4-methyl-1-phenyl-3-pyrazolidone, benzotriazole, 1-phenyl-5-mercaptotetrazole, potassium carbonate, and sodium bromide.
Claim 23
Dependent Claim
11 words
The photographic developer composition of claim 18 comprising Na 4 EDTA.
Claim 24
Independent Claim
113 words
A method of effecting development of an image-wise exposed photographic material comprising effecting development of said material while in contact with a non-hydroquinone and non-alkali metal hydroxide containing aqueous development medium comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof, together with a sulfite, an alkali metal carbonate, and a 3-pyrazolidone compound, said composition having a pH of from 9.50 to 11.75, said developer being present in an amount of at least about 15 grams, said sulfite being present in an amount of from 2 to 20 grams, and said carbonate being present in an amount of from 15 to 30 grams, and water to 1.0 liter.
Claim 25
Independent Claim
113 words
A method of effecting development of an image-wise exposed photographic material comprising effecting development of said material while in contact with a non-hydroquinone and non-alkali metal hydroxide containing aqueous development medium comprising a developer selected from the group consisting of 2-keto gluconic acid and derivatives thereof, together with a sulfite, an alkali metal carbonate, and a 3-pyrazolidone compound, said composition having a pH of from 9.50 to 11.75, said developer being present in an amount of at least about 15 grams, said sulfite being present in an amount of from 2 to 20 grams, and said carbonate being present in an amount of from 15 to 30 grams, and water to 1.0 liter.
Claim 26
Dependent Claim
26 words
The method of claim 22 wherein said developer is selected from the group consisting of 2-keto gluconic acid and sodium, potassium, ammonium and methyl-based derivatives thereof.
Claim 27
Dependent Claim
13 words
The method of claim 22 wherein said developer comprises an alkaline metal salt.
Claim 28
Dependent Claim
12 words
The method of claim 22 wherein said developer is methyl 2-keto gluconate.
Claim 29
Dependent Claim
24 words
The method of claim 22 further comprising a component selected from the group consisting of a sequestering agent, an anti-fogging agent, and mixtures thereof.
Claim 30
Dependent Claim
19 words
The method of claim 22 wherein said sulfite is selected from the group consisting of sodium and potassium sulfite.
Claim 31
Dependent Claim
10 words
The method of claim 22 further comprising a sequestering agent.
Claim 32
Dependent Claim
15 words
The method of claim 28 wherein said sequestering agent comprises EDTA or a salt thereof.
Claim 33
Dependent Claim
22 words
The method of claim 22 wherein said 3-pyrazolidone compound is selected from the group consisting of 1-phenyl-3-pyrazolidone, 1-p-tolyl-3-pyrazolidone, 1-phenyl-4-methyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, and 1-p-chlorophenyl-3-pyrazolidone.
Claim 34
Dependent Claim
18 words
The method of claim 22 wherein said developer composition comprises 4-(hydroxymethyl)-4-methyl-1-phenyl-3-pyrazolidone, benzotriazole, 1-phenyl-5-mercaptotetrazole, potassium carbonate, and sodium bromide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |