US4377625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion and hydrogen evolution inhibitors for current-producing cells having zinc anodes
Assignee: Duracell Inc USA
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Filing: 1981-10-30
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Granted: 1983-03-22
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Expires: 2001-10-30
Abstract
Abstract Corrosion and hydrogen evolution in a current-producing cell possessing a predominantly zinc anode and an aqueous alkaline or acidic electrolyte is significantly inhibited by the addition to said cell of a zinc corrosion and hydrogen evolution-inhibiting amount of at least one chelating agent selected from the group consisting of aminocarboxylic acid, polyamine and aminoalcohol.
Inventors
- 👤 Frank E. Parsen
- 👤 Eleanor J. Rossler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:44
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/628; H01M10/00; H01M10/24; H01M10/26; H01M4/06; H01M6/00; H01M6/04; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
A current-producing cell having a cathode, an anode, an electrolyte selected from the group consisting of an alkaline electrolyte having a pH greater than about 9 and an acidic electrolyte having a pH less than about 5 and at least one electrolyte-carrying separator disposed between said cathode and said anode, the combination being retained in a conductive container having a positive terminal electrically associated with said cathode and a negative terminal electrically associated with said anode, said terminals being electrically insulated from each other, said anode being predominantly zinc; and said cell having therein a corrosion and hydrogen evolution-inhibiting amount of at least one chelating agent selected from the group consisting of aminocarboxylic acid, polyamine and aminoalcohol.
Claim 2
Dependent Claim
117 words
A current-producing cell having a cathode, an anode, an electrolyte selected from the group consisting of an alkaline electrolyte having a pH greater than about 9 and an acidic electrolyte having a pH less than about 5 and at least one electrolyte-carrying separator disposed between said cathode and said anode, the combination being retained in a conductive container having a positive terminal electrically associated with said cathode and a negative terminal electrically associated with said anode, said terminals being electrically insulated from each other, said anode being predominantly zinc; and said cell having therein a corrosion and hydrogen evolution-inhibiting amount of at least one chelating agent selected from the group consisting of aminocarboxylic acid, polyamine and aminoalcohol.
Claim 3
Dependent Claim
31 words
The current-producing cell of claim 1 wherein the chelating agent is present in an amount of from about 0.001% to about 5% by weight of the zinc component of said cell.
Claim 4
Dependent Claim
25 words
The cell of claim 1 wherein the chelating agent is present in an amount of from about 0.01% to about 0.3% by weight of zinc.
Claim 5
Dependent Claim
19 words
The cell of claim 1 wherein the chelating agent is admixed with zinc amalgam powder to form said anode.
Claim 6
Dependent Claim
43 words
The cell of claim 1 wherein the chelating agent is at least one aminocarboxylic acid chelating agent selected from the group consisting of N-hydroxyethethylenediaminetriacetic acid; diethylenetriaminepentaacetic acid; ethylenediaminetetraacetic acid; ethylene glycol-bis-(β-aminoethylether)-N,N 1 -tetraacetic acid; ethyletherdiaminetetraacetic acid; 1-methylethylenediaminetetraacetic acid; nitrilotriacetic acid; N-dihydroxyethylglycine; and, ethylenebis(hydroxyphenylglycine).
Claim 7
Dependent Claim
24 words
The cell of claim 1 wherein the chelating agent is at least one polyamine selected from the group consisting of ethylenediamine, triethylenetetraamine and triaminotriethylene.
Claim 8
Dependent Claim
23 words
The cell of claim 1 wherein the chelating agent is at least one aminoalcohol selected from the group consisting of triethanolamine and N-hydroxyethylenediamine.
Claim 9
Dependent Claim
85 words
A process for inhibiting zinc corrosion and hydrogen evolution in a current-producing cell which has a cathode, a predominantly zinc anode, an electrolyte selected from the group consisting of an alkaline electrolyte having a pH greater than about 9 and an acidic electrolyte having a pH less than about 5, and at least one electrolyte-carrying separator comprising incorporating in said cell a zinc corrosion and hydrogen evolution-inhibiting amount of at least one chelating agent selected from the group consisting of aminocarboxylic acid, polyamine and aminoalcohol.
Claim 10
Dependent Claim
85 words
A process for inhibiting zinc corrosion and hydrogen evolution in a current-producing cell which has a cathode, a predominantly zinc anode, an electrolyte selected from the group consisting of an alkaline electrolyte having a pH greater than about 9 and an acidic electrolyte having a pH less than about 5, and at least one electrolyte-carrying separator comprising incorporating in said cell a zinc corrosion and hydrogen evolution-inhibiting amount of at least one chelating agent selected from the group consisting of aminocarboxylic acid, polyamine and aminoalcohol.
Claim 11
Dependent Claim
30 words
The process of claim 8 wherein the chelating agent is present in an amount of from about 0.001% to about 5% by weight of the zinc component of said cell.
Claim 12
Dependent Claim
25 words
The process of claim 8 wherein the chelating agent is present in an amount of from about 0.01% to about 0.3% by weight of zinc.
Claim 13
Dependent Claim
19 words
The process of claim 8 wherein the chelating agent is admixed with zinc amalgam powder to form said anode.
Claim 14
Dependent Claim
43 words
The process of claim 8 wherein the chelating agent is at least one aminocarboxylic acid chelating agent selected from the group consisting of N-hydroxyethethylenediaminetriacetic acid; diethylenetriaminepentaacetic acid; ethylenediaminetetraacetic acid; ethylene glycol-bis-(β-aminoethylether)-N,N 1 -tetraacetic acid; ethyletherdiaminetetraacetic acid; 1-methylethylenediaminetetraacetic acid nitrilotriacetic acid; N-dihydroxyethylglycine; and, ethylenebis(hydroxyphenylglycine).
Claim 15
Dependent Claim
24 words
The process of claim 8 wherein the chelating agent is at least one polyamine selected from the group consisting of ethylenediamine, triethylenetetraamine and triaminotriethylene.
Claim 16
Dependent Claim
23 words
The process of claim 8 wherein the chelating agent is at least one aminoalcohol selected from the group consisting of triethanolamine and N-hydroxyethylenediamine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |