US3839045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic color developer solution stabilized with lithium ions
Assignee: Eastman Kodak Co
•
Filing: 1973-06-08
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Granted: 1974-10-01
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Expires: 1993-06-08
Abstract
Abstract WHEREIN R is a lower alkyl radical having from one to five carbon atoms, inhibits the formation of the white precipitate characteristically produced when sequestrants of this type are used to sequester ions of heavy metals such as calcium. Alkali metal, ammonium and ethanolamine salts of compounds of the above formula and mono and dialkyl esters thereof with methanol, ethanol, propanol and butanol also provide useful sequestering agents. The incorporation of small amounts of lithium ion into a solution of a heavy metal sequestering agent of the formula:
Inventors
- 👤 J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:27
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3053; C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
4 words
A COLOR DEVELOPING AGENT,
Claim 2
Dependent Claim
4 words
A COLOR DEVELOPING AGENT,
Claim 3
Dependent Claim
8 words
AN AQUEOUS ALKALINE PHOTOGRAPHIC COLOR DEVELOPER SOLUTION COMPRISING
Claim 4
Dependent Claim
8 words
AN AQUEOUS ALKALINE PHOTOGRAPHIC COLOR DEVELOPER SOLUTION COMPRISING
Claim 5
Dependent Claim
3 words
polyvalent metal ions,
Claim 6
Dependent Claim
3 words
polyvalent metal ions,
Claim 7
Dependent Claim
3 words
POLYVALENT METAL IONS,
Claim 8
Dependent Claim
3 words
POLYVALENT METAL IONS,
Claim 9
Dependent Claim
2 words
calcium ions,
Claim 10
Dependent Claim
2 words
calcium ions,
Claim 11
Dependent Claim
58 words
A solution as claimed in claim 1 wherein said sequestering agent is present in said solution in an amount of from about 1 mole per 5000 moles of polyvalent metal ion up to stoichiometric quantIties based on the total polyvalent metal ion concentration and the concentration of lithium ions in said solution is at least about 100 ppm.
Claim 12
Dependent Claim
11 words
a sufficient amount of 1-hydroxyethylidene-1,1-diphosphonic acid to sequester said calcium ions,
Claim 13
Dependent Claim
11 words
a sufficient amount of 1-hydroxyethylidene-1,1-diphosphonic acid to sequester said calcium ions,
Claim 14
Dependent Claim
24 words
A SEQUESTERING AGENT FOR SAID POLYVALENT METAL IONS, SAID SEQUESTERING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF A. PHOSPHORUS COMPOUNDS OF THE FORMULA
Claim 15
Dependent Claim
24 words
A SEQUESTERING AGENT FOR SAID POLYVALENT METAL IONS, SAID SEQUESTERING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF A. PHOSPHORUS COMPOUNDS OF THE FORMULA
Claim 16
Dependent Claim
15 words
A solution as claimed in claim 1 wherein said polyvalent metal ions are calcium ions.
Claim 17
Dependent Claim
24 words
a sequestering agent for said polyvalent metal ions, said sequestering agent being selected from the group consisting of a. phosphorus compounds of the formula
Claim 18
Dependent Claim
24 words
a sequestering agent for said polyvalent metal ions, said sequestering agent being selected from the group consisting of a. phosphorus compounds of the formula
Claim 19
Dependent Claim
31 words
ALKALI METAL IONS SELECTED FROM THE GROUP CONSISTING OF SODIUM IONS AND POTASSIUM IONS IN A CONCENTRATION CAPABLE OF RESULTING IN THE FORMATION OF A PRECIPITATE OF SAID SEQUESTERING AGENT, AND
Claim 20
Dependent Claim
31 words
ALKALI METAL IONS SELECTED FROM THE GROUP CONSISTING OF SODIUM IONS AND POTASSIUM IONS IN A CONCENTRATION CAPABLE OF RESULTING IN THE FORMATION OF A PRECIPITATE OF SAID SEQUESTERING AGENT, AND
Claim 21
Dependent Claim
22 words
sodium or potassium ions in an amount capable of resulting in the formation of a precipitate of the 1-hydroxyethylidene-1, 1-diphosphonic acid, and
Claim 22
Dependent Claim
22 words
sodium or potassium ions in an amount capable of resulting in the formation of a precipitate of the 1-hydroxyethylidene-1, 1-diphosphonic acid, and
Claim 23
Dependent Claim
31 words
alkali metal ions selected from the group consisting of sodium ions and potassium ions in a concentration capable of resulting in the formation of a precipitate of said sequestering agent, and
Claim 24
Dependent Claim
31 words
alkali metal ions selected from the group consisting of sodium ions and potassium ions in a concentration capable of resulting in the formation of a precipitate of said sequestering agent, and
Claim 25
Dependent Claim
15 words
A solution as claimed in claim 1 wherein said alkali metal ions are sodium ions.
Claim 26
Dependent Claim
15 words
A solution as claimed in claim 1 wherein said alkali metal ions are potassium ions.
Claim 27
Dependent Claim
20 words
lithium ions in a concentration sufficient to substantially prevent formation in said solution of a precipitate of said sequestering agent.
Claim 28
Dependent Claim
20 words
lithium ions in a concentration sufficient to substantially prevent formation in said solution of a precipitate of said sequestering agent.
Claim 29
Dependent Claim
19 words
lithium ions in an amount sufficient to substantially prevent the formation of a precipitate of the 1-hydroxyethylidene-1, 1-diphosphonic acid.
Claim 30
Dependent Claim
19 words
lithium ions in an amount sufficient to substantially prevent the formation of a precipitate of the 1-hydroxyethylidene-1, 1-diphosphonic acid.
Claim 31
Dependent Claim
20 words
LITHIUM IONS IN A CONCENTRATION SUFFICIENT TO SUBSTANTIALLY PREVENT FORMATION IN SAID SOLUTION OF A PRECIPITATE OF SAID SEQUESTERING AGENT.
Claim 32
Dependent Claim
20 words
LITHIUM IONS IN A CONCENTRATION SUFFICIENT TO SUBSTANTIALLY PREVENT FORMATION IN SAID SOLUTION OF A PRECIPITATE OF SAID SEQUESTERING AGENT.
Claim 33
Dependent Claim
17 words
A solution as claimed in claim 1 wherein said sequestering agent is the compound of the formula:
Claim 34
Dependent Claim
23 words
A solution as claimed in claim 1 wherein the concentration of said lithium ions is from about 100 ppm to about 450 ppm.
Claim 35
Dependent Claim
27 words
A solution as claimed in claim 1 wherein the weight ratio of said lithium ions to said alkali metal ions is at least about 0.02 to 1.
Claim 36
Dependent Claim
27 words
A solution as claimed in claim 1 wherein the weight ratio of said lithium ions to said alkali metal ions is at least about 0.05 to 1.
Claim 37
Dependent Claim
30 words
A solution as claimed in claim 1 wherein the weight ratio of said lithium ions to said alkali metal ions is in the range from about 0.5:1 to about 1.5:1.
Claim 38
Dependent Claim
16 words
A solution as claimed in claim 1 additionally containing hydroxylamine sulfate, sulfite ion and benzyl alcohol.
Claim 39
Dependent Claim
18 words
A solution as claimed in claim 1 wherein said color developing agent is 4-amino-N-ethyl-N-( Beta -methanesulfonamidoethyl)-m-toluidine sesquisulfate monohydrate.
Claim 40
Dependent Claim
8 words
An aqueous alkaline photographic color developer solution comprising
Claim 41
Dependent Claim
8 words
An aqueous alkaline photographic color developer solution comprising
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |